Design Handbook · The DigiNet control system controls these operating modes automatically per...

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RoofVent®

Design Handbook

Supply and Extract Air Handling Units for Heating and Cooling High Spaces

Safety

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RoofVent® LHWSupply and extract air handling unit with energy recovery for heating high spaces 7

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RoofVent® LKWSupply and extract air handling unit with energy recovery for heating and cooling high spaces 35

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RoofVent® twin heatSupply and extract air handling unit with high-capacity energy recovery for heating high spaces 63

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RoofVent® twin coolSupply and extract air handling unit with high-capacity energy recovery for heating and cooling high spaces 89

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RoofVent® twin pumpSupply and extract air handling unit with reversible heat pump for heating and cooling high spaces 117

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RoofVent® condensSupply and extract air handling unit with gas condensing boiler for heating high spaces 149

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RoofVent® LHSupply and extract air handling unit with optimum fresh air rate for heating high spaces 175

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RoofVent® LKSupply and extract air handling unit with optimum fresh air rate for heating and cooling high spaces 203

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Options

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Control systems

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System design

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Operation

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No longer available

No longer available

No longer available

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Safety A

1 Symbols ____________________________5

2 Operational Safety ___________________5

3 Information for a User Manual __________5

Safety

Content

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1 Symbols

Caution This symbol warns against risks of injury. Please heed all instructions designated by this symbol to prevent injuries and/or death.

Attention This symbol warns against risks of property damage. Please heed the respective instructions to prevent risk of damage to the unit and its functions.

Note This symbol denotes information about the economic use of the equipment or special tips.

2 Operational Safety

RoofVent® units are state of the art design and are safe to operate. Nevertheless, hazards may emanate from the units if they are used incorrectly or not used as intended. Therefore:

■ Please read the operating instructions before unpacking, installing, commissioning and before maintaining the equipment.

■ Store the operating instructions so that they are easily accessible.

■ Observe all appropriate informational and warning signs. ■ Follow the local safety and accident prevention regula-

tions at all times. ■ RoofVent® units may only be installed, operated and main-

tained by authorized, skilled and trained specialists. Specialists as defined by these operating instructions are those persons who, based on their training, knowledge and experience as well as their knowledge of the relevant regulations and guidelines, can carry out the work assi-gned to them and recognize potential hazards.

3 Information for a User Manual

According to the accident prevention regulations of some countries, the operator of equipment must meet certain requirements for the prevention of occupational accidents and instruct the operating personnel as to the hazards that may occur and how to prevent them. This can be done with the help of the user manual. In addition to national regulations for accident prevention and environmental protection, a user manual should also include the most important items of the operating instructions.

Safety

Symbols

RoofVent® LHWSupply and extract air handling unit with energy recovery for heating high spaces

B

1 Use _______________________________8

2 Construction and operation_____________8

3 Technical data ______________________ 15

4 Design example _____________________24

5 Options ___________________________26

6 Control systems_____________________27

7 Transport and installation _____________28

8 Specification texts ___________________32

RoofVent® LHW

Content

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1 Use

1.1 Intended use

RoofVent® LHW units are used to supply fresh air, for the disposal of extract air as well as for heating coupled with energy recovery in high spaces. Also included under intended use are compliance with the installation, commis-sioning, operating and maintenance provisions (operating manual).Any use beyond this is considered improper use. The manufacturer shall not be held responsible for any damage resulting from such use.

1.2 User group

RoofVent® LHW units may only be installed, operated and serviced by authorised and trained specialist personnel who are familiar with the equipment and aware of the dangers involved.The operating manual is for English-speaking operating engineers and technicians as well as specialists in building, heating and ventilation technology.

1.3 Risks

RoofVent® LHW units are built to correspond to the state of the art and to current safety standards. However, despite all precautionary measures taken, there are still some potential hazards which are not immediately obvious, such as:

■ Dangers when working with the electrical systems ■ During work on the ventilation unit, parts (e.g. tools) may

fall or be dropped. ■ Dangers when working on the roof ■ Damage to devices or components due to lightning ■ Malfunctions as a result of defective parts ■ Hazards from hot water when working on the hot water

supply ■ The ingress of water through the roof unit if the access

panels are not closed correctly

2 Construction and operation

The RoofVent® LHW provides fresh air supply and extract air removal as well as heating for large spaces (production halls, shopping centres, sports halls, exhibition halls etc.). It fulfils the following functions:

■ Heating (with connection to central hot water supply) ■ Fresh air supply ■ Extract air removal ■ Recirculation ■ Energy recovery ■ Air distribution via Air-Injector ■ Air filtration

A ventilation system consists of several autonomous RoofVent® LHW units and, as a rule, works without supply and extract air ducts. The units are decentrally installed in the roof and are also serviced from roof level.Thanks to their high output and efficient air distribution, RoofVent® LHW units have a large operating range. This means that compared with other systems, only few units are necessary to create the required conditions.Three unit sizes, various coil types and a series of accesso-ries make it possible to provide a customised solution for any hall.

2.1 Unit construction

The RoofVent® LHW consists of the following components: ■ Roof unit with energy recovery: self-supporting casing

made of Aluzinc sheet steel, insulated inside (class B1) ■ Filter box: available in three standard lengths per unit size for adjusting to specific dimensional requirements

■ Heating section: coil connections possible on each side (usually under-neath the extract air grille)

■ Air-Injector: patented, automatically adjustable vortex air distributor for draught-free air distribution over a large area

The unit is delivered in two sections: roof unit and below-roof unit (see Fig. B1). The components are bolted together and can be dismantled individually.

RoofVent® LHW

Use

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2.2 Air distribution with the Air-Injector

The patented air distributor – called the Air-Injector – is the core element. The air discharge angle is set by means of the adjustable guide vanes. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air. The air is therefore blown into the room vertically downward, conically or horizontally. This ensures that:

■ each RoofVent® LHW ventilates and heats a large floor area,

■ no draughts occur in the occupied area, ■ the temperature stratification in the room is reduced, thus

saving energy.

Above-roof unit: Roof unit with energy recovery

Below-roof unit:a Filter boxb Heating sectionc Air-Injector

Fig. B1: Components of the RoofVent® LHW

abc

RoofVent® LHW

Construction and operation

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RoofVent® LHW


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Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to horizontal

Frost controller: prevents the coil freezing

Extract air grille

Extract air filter: bag filter with differential pressure switch for filter monitoring

ER damper and bypass damper: opposed dampers for regulation of energy recovery, with actuator

Access panel: access to extract air filter

Weather louvre door: access to the fresh air filter and to the DigiUnit terminal box

Fresh air filter: bag filter with differential pressure switch for filter monitoring

Fresh air damper and recirculation damper: opposed dampers for switching between fresh air and recirculation opera-tion, with actuator

Gravity damper: closes the bypass during shutdown and thus prevents heat loss

Exhaust air fan: twin impeller centrifugal fan with maintenance-free drive

Exhaust air grille: access to exhaust air fan

Plate heat exchanger: with bypass for energy recovery control and condensate drain

Access panel: access to supply air fan

Supply air fan: twin impeller centrifugal fan with maintenance-free drive

Access panel: access to heating coil

Heating coil: LPHW coil consisting of copper tubes with aluminium fins

Fig. B2: Components of the RoofVent® LHW

RoofVent® LHW


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Fresh air inlet through weather louvre door

Filter with differential pressure switch

Fresh air damper with actuator

Plate heat exchanger

Supply air fan

Silencer and diffuser

LPHW heating coil

Frost controller

Supply air sensor

Air-Injector with actuator

Extract air inlet through extract air grille

Extract air sensor


Recirculation damper (opposed to the fresh air damper)

ER/bypass damper with actuator

Gravity damper

Exhaust air fan


Exhaust air outlet through exhaust air grille

Fig. B3: Operational diagram, RoofVent® LHW

RoofVent® LHW


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2.3 Operating modes

The RoofVent® LHW has the following operating modes: ■ Off ■ Ventilation ■ Ventilation (reduced) ■ Recirculation ■ Recirculation night

■ Exhaust air ■ Supply air ■ Night cooling summer ■ Emergency operation

The DigiNet control system controls these operating modes automatically per control zone, in accordance with the scheduler (exception: emergency operation). In addition, you can:

■ manually switch the operating mode of a control zone, ■ switch each individual RoofVent® unit to the following operating modes: Off,

Recirculation, Exhaust air, Supply air and Emergency operation.

Code 1) Operating mode Use Diagram Description

OFF OffThe fans are turned off. Frost protection remains active. There is no room tempe-rature control.

If the unit is not needed

Supply air fan ................... OffExhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. ClosedRecirculation damper ....... OpenHeating ............................ Off

VE2 VentilationThe RoofVent® unit blows fresh air into the room and draws off spent room air. Heating and energy recovery are cont-rolled depending on the heat demand and temperature conditions.The room temperature set value day is active.

During room use Supply air fan ................... OnExhaust air fan ................. OnEnergy recovery ............... 0 – 100 %Fresh air damper .............. OpenRecirculation damper ....... ClosedHeating ............................ 0 – 100 %

VE1 Ventilation (reduced)Like VE2, but with reduced air flow rateThe room temperature set value day is active.

During room use(only for fans with variable air flow rate)

REC RecirculationOn/Off operation: In the event of heat demand, the RoofVent® unit draws in room air, warms it and blows it back into the room.The room temperature set value day is active.

For pre-heating Supply air fan ................... On *)

Exhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. ClosedRecirculation damper ....... OpenHeating ............................ On *)

*) during heat demandRECN Recirculation night

Like REC, but with room temperature set value night

During the night and on weekends

RoofVent® LHW


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EA Exhaust airThe RoofVent® unit extracts spent room air. There is no room temperature control.

For special cases Supply air fan ................... OffExhaust air fan ................. OnEnergy recovery ............... 0 %Fresh air damper .............. OpenRecirculation damper ....... ClosedHeating ............................ Off

SA Supply airThe RoofVent® unit blows fresh air into the room. Heating is controlled depen-ding on the heat demand and tempera-ture conditions.Spent room air passes through open windows and doors or another system provides extraction.The room temperature set value day is active.

For special cases Supply air fan ................... OnExhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. OpenRecirculation damper ....... ClosedHeating ............................ 0 – 100 %

NCS Night cooling summerOn/Off operation: If current tempera-tures allow, the RoofVent® unit blows cool fresh air into the room and extracts warmer room air. The room temperature set value night is active.The unit blows the supply air vertically downwards to achieve the greatest possible efficiency.

For free cooling during the night

Supply air fan ................... On *)

Exhaust air fan ................. On *)

Energy recovery ............... 0 %Fresh air damper .............. Open *)

Recirculation damper ....... Closed *)

Heating ............................ Off

*) depending on temperature conditions

– Emergency operationThe RoofVent® unit draws in room air, warms it and blows it back into the room. The heater is switched on via manual control of the mixing valve.There is no room temperature control.

If the DigiNet system is not operating (e.g. before commissio-ning)

Supply air fan ................... OnExhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. ClosedRecirculation damper ....... OpenHeating ............................ On

1) This is the code for the respective operating mode in the DigiNet control system (see Part K 'Control systems').

Table B1: Operating modes of the RoofVent® LHW

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3 Technical data

3.1 Unit type reference

Below-roof unit

LHW - 6 / DN5 / LW + F00 - H.B - D / ...

Unit typeRoofVent® LHW

Unit size6, 9 or 10

ControlDN5 Design for DigiNet 5KK Design for non-Hoval control

Roof unitRoof unit with energy recovery

Filter boxF00 Filter box, shortF25 Filter box, mediumF50 Filter box, long

Heating section and coil typeH.A Heating section with coil type AH.B Heating section with coil type BH.C Heating section with coil type C

Air-Injector

Options

Table B2: Unit type reference

3.2 Application limits

Extract air temperature max. 50 °C

Extract air relative humidity max. 60 %

Moisture content of extract air max. 12.5 g/kg

Fresh air temperature Min. -30 °C

Heating medium temperature max. 120 °C

Operating pressure max. 800 kPa

Supply air temperature max. 60 °C

Minimum operating time VE2 min. 30 min

Table B3: Application limits of the RoofVent® LHW

RoofVent® LHW

Technical data

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3.3 Air flow rate, electrical connections

Unit type LHW-6 LHW-9 LHW-10

Air distribution Nominal air flow rate 1) Supply air m³/h 5500 8000 8800

Exhaust air m³/h 5500 8000 8800

Floor area reached Max. m² 480 797 915

Energy recovery Heat recovery efficiency, dry % 60 63 57

Heat recovery efficiency, wet % 68 73 65

Fan characteristics Supply voltage V AC 3 x 400 3 x 400 3 x 400

Permitted voltage tolerance % ± 10 ± 10 ± 10

Frequency Hz 50 50 50

Active power per motor kW 1.8 3.0 4.5

Current consumption A 3.9 6.0 9.9

Set point of thermal relays A 4.6 7.5 11.4

Speed of rotation (nominal) rpm 1440 1464 1450

Actuators Supply voltage V AC 24 24 24


Control voltage V DC 2…10 2…10 2…10

Torque Nm 10 10 10

Run time for 90° rotation s 150 150 150

Filter monitoring Factory setting of differential pressure switch Pa 300 300 3001) Refers to: RoofVent® LHW with heating coil type B and vertical supply air discharge direction

Table B4: Technical data, RoofVent® LHW

RoofVent® LHW

Technical data

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3.4 Sound levels

Unit type LHW-6 LHW-9 LHW-10Operating mode VE2 REC VE2 REC VE2 RECPosition

Sound pressure level (at a distance of 5 m) 1) dB (A) 46 60 58 47 46 52 66 57 49 48 54 68 60 52 51

Total sound power level dB (A) 68 82 80 69 68 74 88 79 71 70 76 90 82 74 73

Octave sound power level 63 Hz dB (A) 51 63 62 48 54 52 69 59 54 56 54 71 62 57 59

125 Hz dB (A) 55 71 70 56 63 63 78 70 60 63 65 80 73 63 662) 250 Hz dB (A) 61 76 74 64 63 65 81 71 63 66 67 83 74 66 69

500 Hz dB (A) 61 75 71 61 58 66 81 70 62 61 68 83 73 65 64

1000 Hz dB (A) 65 77 72 63 57 71 81 72 67 60 73 83 75 70 63

2000 Hz dB (A) 57 72 72 60 56 66 80 73 64 58 68 82 76 67 61

4000 Hz dB (A) 49 71 71 57 48 58 76 71 58 50 60 78 74 61 53

8000 Hz dB (A) 36 65 63 49 42 44 70 62 51 41 46 72 65 54 44

1) with hemispherical radiation in a low-reflection environment2) outdoors (roof unit)

Table B5: Sound levels, RoofVent® LHW

RoofVent® LHW

Technical data

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3.5 Heat output

Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the performance data for other design data. You can download 'HK-Select' free of charge on the Internet.

Fresh air temperature -5 °C -15 °CLPHW Size Type Q QTG Hmax tS ∆pW mW Q QTG Hmax tS ∆pW mW

°C kW kW m °C kPa l/h kW kW m °C kPa l/h

80/60 LHW-6 A 37 20 16.2 28 8 1569 39 16 18.3 26 8 1663

LHW-6 B 52 36 12.4 36 14 2228 55 33 13.0 34 16 2363

LHW-6 C 80 64 9.5 51 13 3447 85 63 9.6 50 15 3656

60/40 LHW-6 A 23 7 25.0 21 3 984 25 3 25.0 19 4 1079

LHW-6 B 32 16 18.1 26 6 1393 36 13 20.4 24 8 1530

LHW-6 C 51 35 12.6 36 6 2185 56 33 12.9 35 7 2395

80/60 LHW-9 A 59 39 14.7 32 7 2544 62 34 15.7 30 7 2678LHW-9 B 75 55 12.5 37 10 3235 79 51 12.9 36 11 3407LHW-9 C 116 96 9.7 52 10 4984 122 94 9.8 51 11 5248

60/40 LHW-9 A 37 16 22.5 24 3 1570 40 12 25.0 22 3 1706LHW-9 B 46 26 17.8 27 5 1992 51 22 19.4 26 5 2167LHW-9 C 73 52 12.8 36 5 3119 79 51 13.0 36 5 3385

80/60 LHW-10 A 74 46 23.5 24 10 3173 74 35 23.5 24 10 3173

LHW-10 B 83 55 14.3 35 12 3549 88 49 15.2 33 14 3778

LHW-10 C 129 101 10.8 50 12 5529 137 98 10.9 49 14 5887

60/40 LHW-10 A 50 22 25.0 16 5 2151 50 11 25.0 16 5 2151

LHW-10 B 52 24 21.5 25 6 2231 57 18 25.0 23 7 2465

LHW-10 C 82 54 14.4 35 6 3528 91 52 14.8 34 7 3888

Legend: Type = Type of heating coilQ = Heat outputQTG = Output to cover fabric heat lossesHmax = Maximum mounting heighttS = Supply air temperature∆pW = Water pressure dropmW = Water flow rate

Refers to: Room air 18 °C, extract air 20 °C/40 % rel. humidity

Table B6: Heat output, RoofVent® LHW

Note The output for coverage of the fabric heat losses (QTG) allows for the ventilation heat requirement (QV) and the energy recovery output (QER) under the respective air conditions. It is calculated as follows: QTG = Q + QER – QV

RoofVent® LHW

Technical data

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3.6 Minimum and maximum distances

X/2 X

Y

Unit type LHW-6 LHW-9 LHW-10 Align the RoofVent® units so that no unit draws in the exhaust air from another unit as fresh air.

The extract air grille must be easily accessible.

Provide a clear space of approx. 1.5 m on the side opposite to the heating coil connections for service and maintenance.

The stream of supply air must be able to spread unobs-tructed (note position of beams and lamps).

Unit clearance X Min. m 11.0 13.0 14.0

Max. m 22.0 28.0 30.0

Mounting height Y 1) Min. 1) m 4.0 5.0 5.0

Max. 2) m 9.0 … 25.01) The minimum height can be reduced by 1 m in each case using the 'Air

outlet box' option (see Part J 'Options').2) The maximum height varies depending on the ancillary conditions (for

values, see Table B6).

Table B7: Minimum and maximum distances

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Technical data

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3.7 Dimensions and weight

Roof unit LW

Filter box short F00 / medium F25 / long F50

Heating section H

Air-Injector D

Cable feedthroughs for electrical connections

Access panel

Return

Flow

Fig. B4: Dimensional drawing for RoofVent® LHW (dimensions in mm)

RoofVent® LHW

Technical data

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Unit type LHW-6 LHW-9 LHW-10

Dimensions of roof unit

A mm 2100 2400 2400

B mm 1080 1380 1380

C mm 1390 1500 1500

D mm 600 675 675

E mm 1092 1392 1392

Dimensions of below-roof unit

Filter box design F00 F25 F50 F00 F25 F50 F00 F25 F50

G mm 940 1190 1440 980 1230 1480 980 1230 1480

S mm 1700 1950 2200 1850 2100 2350 1850 2100 2350

H mm 530 780 1030 530 780 1030 530 780 1030

F mm 980 1240 1240

J mm 410 450 450

K mm 848 1048 1048

M mm 270 300 300

N mm 101 111 111

O mm 767 937 937

P mm 758 882 882

Q mm 490 570 570

R mm 900 1100 1100

V mm 500 630 630

Heating coil data

Coil type A B C A B C A B C

Water content l 3.1 3.1 6.2 4.7 4.7 9.4 4.7 4.7 9.4

L " Pipe thr. 1 ¼ (female)

Pipe thr. 1 ½ (female)


Weight Roof unit kg 403 577 565

Below-roof unit (with F00) kg 130 130 137 182 182 192 182 182 192

Filter box F00 kg 63 82 82

Heating section kg 30 30 37 44 44 54 44 44 54

Air-Injector kg 37 56 56

Total (with F00) kg 533 533 540 759 759 769 747 747 757

Filter box F25 1) kg + 11 + 13 + 13

Filter box F50 1) kg + 22 + 26 + 261) Additional weight compared to the design with filter box F00

Table B8: Dimensions and weights, RoofVent® LHW

RoofVent® LHW

Technical data

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3.8 Air flow rate with additional pressure drops

Pressure increase in Pa Exhaust air

LHW-6

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

00 0 6 0 0 5 5 0 0 0 5 0 0 5 4 0 0 0 4

Supply air

Example:An additional pressure drop of 84 Pa results in a new air flow rate of 5100 m³/h.

Air flow rate in m³/h

Diagram B1: Air flow rate, RoofVent® LHW-6 with additional pressure drops


LHW-9

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 5 8 0 0 0 8 0 0 5 7 0 0 0 7 0 0 5 6

Supply air



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LHW-10

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 0 9 0 0 5 8 0 0 8 8 0 0 0 8 0 0 5 7 0 0 0 7

Supply air



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Technical data

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4 Design example

Design data ■ Required fresh air flow rate or air change rate ■ Hall geometry (length, width, height) ■ Design fresh air temperature ■ Desired room temperature (in the occupied area) ■ Extract air conditions 1)

■ Fabric heat losses (portion to be covered by the RoofVent® units)

■ Internal heat gains (machines, lighting, etc.) ■ Heating medium

1) The extract air temperature is generally higher than the temperature in the occupied area. This is the result of unavoidable temperature stratification in high spaces, but is reduced to a minimum with the Air-Injector. A tempe-rature gradient of only 0.2 K per metre height can therefore be assumed.

ExampleFresh air flow rate ......................................30'000 m³/hHall geometry (L x W x H) ...................... 52 x 45 x 9 mDesign fresh air temp. ......................................... -5 °CDesired room temperature...................................18 °CExtract air conditions ............................... 20 °C / 40 %Fabric heat losses ........................................... 220 kW

Internal heat gains ............................................. 36 kW

Heating medium ................................. LPHW 80/60 °C

Room temperature:..............................................18 °CTemperature gradient: .................................... 9 · 0.2 KExtract air temperature: ....................................≈ 20 °C

Required number of units nreqBased on the air flow rate per unit (see Table B4), select a trial unit size. (Depending on the results of further calcu-lations, repeat the layout design for another unit size if necessary.)

nreq = Vreq / VU

Vreq = required fresh air flow rate in m³/hVU = air flow rate for the selected unit size in m³/h

Approximate selection: Unit size LHW-9

nreq = 30'000 / 8'000nreq = 3.75

Select 4 LHW-9s.

Actual fresh air flow rate V (in m³/h)

V = n · VU

n = Selected number of units

V = 4 · 8'000V = 32'000 m³/h

Effective fabric heat losses QTeff (in kW)

QTeff = QT – QM

QT = fabric heat losses in kWQM = internal heat gains in kW

Use the following criteria for calculation of internal heat gains (connected loads of machines and lighting): Operating times, diversity, direct heat output through convection, indi-rect heat output through radiation, etc.

QTeff = 220 – 36QTeff = 184 kW

Necessary output to cover fabric heat losses per unit QTG (in kW)

QTG = QTeff / n

QTG = 184 / 4QTG = 46 kW

RoofVent® LHW

Design example

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Selection of coil typeFrom Table B6, select the required coil type based on the output necessary to cover the fabric heat losses per unit.

Select coil type B with 55 kW heat output to cover the fabric heat losses at LPHW 80/60 °C and fresh air temperature -5 °C.

Checking the ancillary conditions ■ Maximum mounting height

Select a different coil type or unit size if the actual moun-ting height (= distance between the floor and the bottom edge of the unit) is greater than maximum mounting height Hmax (see Table B6).

■ Maximum floor area reached Calculate the floor area reached per unit using the selected number of units. If it exceeds the maximum value listed in Table B4, increase the number of units.

■ Compliance with minimum and maximum distances Check the resulting distances based on the hall geometry and arrangement of the units, using the information in Table B7.

Actual mounting height = 7.2 m Max. mounting height Hmax = 12.5 m → OK

Floor area per unit = 52 · 45 / 4 = 585 m² Max. floor area reached = 797 m² → OK

Minimum and maximum distances can be complied with when units are arranged symmetrically. → OK

Definitive number of unitsWith a larger number of units, there is more flexibility of operation. However, the costs are also higher. For an optimal solution, compare both the costs and ventilation quality of the system.

Select 4 LHW-9s with heating coil type B. They ensure cost-effective and energy-saving operation.

RoofVent® LHW

Design example

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5 Options

RoofVent® LHW units can be adapted to the requirements of the specific project with a series of options. You will find a detailed description of all optional components in Part J 'Options' of this handbook.

Option Use

ColdClimate design For installation of the RoofVent® unit in areas where the fresh air temperatures fall below –30 °C

Oil-proof design When using the RoofVent® unit in applications with high oil content in the extract air

Hygiene design When using the RoofVent® unit in applications with higher hygiene requirements (corresponds to VDI 6022)

Fans with variable air flow rate For operation of the unit with variable air flow rate (supply air and exhaust air)

High-pressure fan, supply air To overcome additional external pressure drop (e.g. from supply air ducts installed on-site)

High-pressure fan, exhaust air To overcome additional external pressure drop (e.g. from extract air ducts installed on-site)

Hydraulic assembly diverting system

To facilitate hydraulic installation

Magnetic mixing valve For continuous regulation of the heating coil (ready-to-connect)

Fresh air silencer For reduction of noise from the weather louvre door

Exhaust air silencer For reduction of noise from the exhaust air grille

Supply air silencer For reduction of noise within the room

Extract air silencer For reduction of noise within the room

Acoustic cowl For reduction of noise within the room (in the Air-Injector)

Actuators with spring return As additional frost protection (close the fresh air damper and the ER damper during a power failure)

Air outlet box When using the RoofVent® unit in low-roofed halls (instead of the Air-Injector)

Drop eliminator To drain condensate from the plate heat exchanger onto the roof

Design for injection system For installation of the RoofVent® unit with a hydraulic injection system (integrated pump control)

Table B9: Availability of options for RoofVent® LHW

RoofVent® LHW

Options

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6 Control systems

There are basically two possibilities for controlling the RoofVent® LHW:

System Description

Hoval DigiNet We strongly advise that the RoofVent® LHW should be cont-rolled by Hoval DigiNet. This control system, developed speci-fically for Hoval indoor climate systems, offers the following advantages:

■ DigiNet utilises the full potential of the decentralised systems. It controls each ventilation unit individually, depen-ding on local conditions.

■ DigiNet allows for maximum flexibility of operation with respect to the control zones, unit combinations, operating modes and operating times.

■ DigiNet regulates the air distribution and thus ensures maximum ventilation efficiency.

■ DigiNet regulates the energy recovery output in the plate heat exchanger.

■ The ready-to-connect units with integrated control compo-nents are easy to plan and install.

■ Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules.

You can find a detailed description of the Hoval DigiNet in Part K 'Control systems' of this handbook.

Non-Hoval system RoofVent® LHWs can also be controlled with non-Hoval systems. However, the non-Hoval system must take the special features of the decentralised systems into account.In the design for non-Hoval control, the RoofVent® LHW comes only with a basic terminal box instead of the DigiUnit terminal box. Additional information can be found in the sepa-rate description 'Terminal box unit RoofVent® LHW' (available on request).

Table B10: Control systems, RoofVent® LHW

RoofVent® LHW

Control systems

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7 Transport and installation

7.1 Assembly

Caution Risk of injury as a result of incorrect handling. Have transport and assembly work carried out by trained specialists !

RoofVent® LHW units are delivered in 2 sections (roof unit, below-roof unit) on a wooden pallet. Parts which belong together are labelled with the same unit number.

Note Depending on the optional components, the delivery may consist of multiple parts (such as when a supply air silencer is installed). In this case a forklift truck or a crane is required for assembling the below-roof unit on site.

The following guidelines are important when preparing for assembly:

■ The units are assembled from roof level. A crane or heli-copter is required.

■ To transport the unit to the roof, 2 hoisting slings are required (approx. length 6 m). If steel cables or chains are used, the unit corners must be properly protected.

■ Make sure that the roof frames correspond to the specifi-cations in Part L 'System design.'

■ Define the desired orientation of the units (position of the coil connections).

■ The units are held in the roof frame by means of their own weight. Silicone, PU foam or similar is required for sealing.

■ For units with exhaust air silencers, additional attachment to the roof frame is required.

■ Follow the assembly instructions included.

Fig. B5: RoofVent® roof units are installed from roof level.

7.2 Hydraulic installation

Caution Risk of injury as a result of incorrect handling. Hydraulic installation must be carried out by trained specialists only !

The Hoval DigiNet control system is designed for a distri-butor circuit with separate hydraulic connection of the units; i.e. a mixing valve is installed in front of each unit. The diver-ting system is used as standard.

Boiler system requirements ■ Adjust the hydraulic system to the control zone divisions. ■ Hydraulically coordinate the pipework for the individual

units within a control zone to ensure even distribution. ■ Starting at a fresh air temperature of 15 °C, the heating

medium (max. 120 °C) must be available at the mixing valve without delay in the required amount and at the required temperature.

■ A flow temperature control which is dependent on the fresh air temperature is required.

The Hoval DigiNet control system switches the Enable heating on for 1 minute once a week. This prevents the main pump from blocking after a prolonged shutdown.

Pipework requirements ■ Use 3-way mixing valves with linear characteristics and

high quality. ■ The valve authority must be ≥ 0.5. ■ The valve actuator must have a short run time (5 s). ■ The valve actuator must be continuous, i.e. the stroke

changes in proportion to the control voltage (DC 0…10 V). ■ The valve actuator must be designed for emergency

operation with a separate manual control (AC 24 V). ■ Install the valve close to the unit (max. distance 2 m).

Caution Risk of injury from falling parts. Do not apply any loads to the coil, e.g. by means of the flow or return !

Note Use the 'Hydraulic assembly' or 'Magnetic mixing valve' options for quick and easy hydraulic installa-tion.

RoofVent® LHW

Transport and installation

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DigiUnit terminal box

novaNet system bus

Power supply

Connection box

Magnetic mixing valve

Collective trouble indicator

Fresh air sensor

Room air sensor

Trouble input heating

Main pump

DigiMaster

Zone control panel

Enable heating

Heating control panel

Fig. B6: Conceptual drawing for hydraulic diverting system

< 2

m

RoofVent® LHW


30

7.3 Electrical installation

Caution Danger from electric current. The electrical installation must be carried out by a qualified electrician!

■ Comply with all relevant legislation (e.g. EN 60204-1). ■ For long supply lines, select cable cross-sections in

accordance with the technical regulations. ■ Carry out electrical installation in accordance with the

wiring diagram (for wiring within the unit, see Fig. B7). ■ Install the system bus for the control systems separately

from the mains cables. ■ Establish plug connections from the Air-Injector to the filter box and from the filter box (inside) to the roof unit.

■ Wire the mixing valves to the connection box. (There is a plug connection for Hoval magnetic mixing valves.)

■ For injection system: Wire the pump to the DigiUnit terminal box.

■ Make sure there is onsite overload protection equipment for the mains connection line of the zone control panel (short circuit resistance 10 kA).

Attention Use an AC-DC sensitive residual current circuit-breaker if fans with variable air flow rate are installed in the unit.

DigiUnit terminal box with isola-tion switch

Cable feedthroughs and plug-in connections

Power supply

Bus cable

Connection box

Fig. B7: Wiring in unit

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Component Description Voltage Cable Option Comment


Power supply 3 x 400 V LHW-6: 5 x 4 mm²LHW-9: 5 x 6 mm²LHW-10: 5 x 10 mm²

novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Part K, chap. 2.4

Heating pump 3 x 400 V 4 x 2.5 mm² For injection system

Zone control panel3-phase

Power supply 3 x 400 V 5 x … mm² Depending on options


Room air sensor 2 x 1.5 mm² Max. 170 mShielded cable

Fresh air sensor 2 x 1.5 mm² Max. 170 m

Enable heating Volt-freeMax. 230 V

3 x 1.5 mm² 2 A max.Per zone

Trouble input heating 24 V 3 x 1.5 mm² Per zone

Collective trouble indicator Volt-freeMax. 230 V

3 x 1.5 mm² Max. 6 A

Special function on terminal 24 V 3 x 1.5 mm² Per special function

Power supply for RoofVent® LHW

3 x 400 V LHW-6: 5 x 4 mm²LHW-9: 5 x 6 mm²LHW-10: 5 x 10 mm²

Per RoofVent® LHW

Main pump 3 x 400 V 4 x 2.5 mm² Per pump

Humidity sensor 24 V 4 x 1.5 mm² Max. 170 m

CO2 sensor 24 V 4 x 1.5 mm² Max. 170 m

Variant:










3 x 1.5 mm² Max. 6 A





Table B11: Cable list

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8 Specification texts

RoofVent® LHW supply and extract air handling unit, consis-ting of:

■ Roof unit with energy recovery ■ Filter box ■ Heating section ■ Air-Injector ■ Control systems

All components are wired ready-to-connect.

8.1 Roof unit with energy recovery LW

Self-supporting, weatherproof casing made from Aluzinc sheet steel, insulated on the inside, with weather louvre door for easy access to the fresh air filter and DigiUnit terminal box, access panel with quick-release fasteners for easy access to the extract air filter, isolation switch outside for interruption of the high-voltage supply.The roof unit includes:

■ Fresh air filter (bag filter, class G4) with differential pres-sure switch for filter monitoring

■ Opposed fresh air and recirculation dampers with actuator ■ Plate heat exchanger made of aluminium with bypass,

condensate collecting channel and siphon to the roof, including ER and bypass dampers with actuators to regu-late the energy recovery

■ Maintenance-free, direct-drive supply air fan ■ Maintenance-free, direct-drive exhaust air fan ■ DigiUnit terminal box with DigiUnit controller as part of the

Hoval DigiNet control system.

DigiUnit controller DU5Control module, fully wired to the components of the ventila-tion unit (fans, actuators, temperature sensors, frost cont-roller, filter monitoring):

■ Controls the unit, including the air distribution, according to the specifications of the control zone

■ Controls the supply air temperature using cascade control

High-voltage section ■ Mains power terminals ■ Isolation switch (can be operated from the outside) ■ Motor contactor for each fan ■ Fuse for the electronics ■ Transformer for the DigiUnit controller, the mixing valve

and the actuators ■ Relays for emergency operation ■ Connecting terminals for actuators and temperature

sensors ■ Control box heating

Type LW-… /DN5

Nominal air flow rate, supply air/exhaust air

… m³/h

Heat recovery efficiency, dry … %

Active power per motor … kW

Supply voltage 3 x AC 400 V

Frequency 50 Hz

8.2 Filter box F00 / F25 / F50

Casing made from Aluzinc sheet steel with extract air grille and access panel. The filter box includes:

■ Extract air filter (bag filter class G4) with differential pres-sure switch for filter monitoring

■ Extract air temperature sensor ■ Sound attenuation body as supply air diffuser

Type F-…

8.3 Heating section H.A / H.B / H.C

Aluzinc sheet steel casing, includes the LPHW heating coil made of copper tubes and aluminium fins and the frost controller.

Type H.__-…

Heat output … kW

Heating medium LPHW … / … °C

At air inlet temperature … °C

8.4 Air-Injector D

Casing made from Aluzinc sheet steel with: ■ Vortex air distributor with concentric outlet nozzle, adjus-

table vanes and integrated absorber hood ■ Actuator for automatic adjustment of the air distribution ■ Supply air sensor ■ Electric connection box (includes the terminals for the

heating mixing valve)

Type D -9

Floor area reached … m²

RoofVent® LHW

Specification texts

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8.5 Options

ColdClimate design ■ Cold-resistant materials ■ Fans with downtime heating ■ Valve actuators with spring return and additional heating ■ Heating coil type X with water-side frost monitoring ■ Plate heat exchanger with differential pressure switch

Oil-proof design ■ Oil-proof materials ■ Extract air filter class F5 ■ Condensate drain from the plate heat exchanger to the drip tray in the filter box

■ Filter box F25 in oil-tight design with integrated oil/conden-sate drip tray and drain connection

Hygiene design ■ Fresh air filter class F7 ■ Extract air filter class F5

Fans with variable air flow rate VAR ■ Maintenance-free, direct-drive supply air fan with

frequency converter ■ Maintenance-free, direct-drive exhaust air fan with

frequency converter

High-pressure fan supply air HZMaintenance-free, direct-drive high-pressure supply air fan

High-pressure fan exhaust air HFMaintenance-free, direct-drive high-pressure exhaust air fan

Hydraulic assembly diverting system HGPrefabricated assembly for hydraulic diverting system, consisting of magnetic mixing valve, balancing valve, ball valve, automatic air vent and screw connections for connec-tion to the unit and to the distributor circuit; ready-to-connect mixing valve for connection to the connection box; sized for the respective heating coil and the Hoval DigiNet control system

Magnetic mixing valve ..HVContinuous regulating valve with magnetic drive, ready for connection to the connection box, sized for the respective heating coil

Fresh air silencer ASDAs an attachment to the weather louvre door, casing consis-ting of Aluzinc sheet steel with lining of sound attenuation material, for reducing noise from the weather louvre door, insertion attenuation _____ dB

Exhaust air silencer FSDAs an attachment to the exhaust air grille, casing consisting of Aluzinc sheet steel with built in sound attenuation splitters,

for reducing the noise from the exhaust air grille, insertion attenuation _____ dB

Supply air silencer ZSDAs an inserted component in the below-roof unit, casing consisting of Aluzinc sheet steel with built in sound attenu-ation splitters, for reducing the noise in the room, insertion attenuation _____ dB

Extract air silencer ABSDAs an attachment to the extract air grille, casing consisting of Aluzinc sheet steel with built in sound attenuation split-ters, for reducing the noise in the room, insertion attenuation _____ dB

Acoustic cowl AHDConsisting of an absorber hood of large volume and a screen with a lining of sound attenuation material, insertion attenua-tion 4 dB

Actuators with spring return SMFModulating actuators with safety function in the case of a power failure, mounted and wired on the fresh air damper and ER damper

Air outlet box AKConsisting of Aluzinc sheet steel, with four adjustable exhaust air grilles (replaces the Air-Injector)

Drop eliminator TAConsisting of aluminium fins, fitted in the extract air flow on the air inlet side of the plate heat exchanger, to drain condensate onto the roof

Design for injection system ESControl and high-voltage section for the heating pump integ-rated into the DigiUnit terminal box

RoofVent® LHW

Specification texts

34

8.6 Control systems

Digital control system for the energy-optimised operation of decentralised indoor climate systems:

■ System set up according to OSI reference model ■ Onsite connection to the individual control modules using

novaNet system bus in a serial topology ■ Cross-communication with equal priority (peer-to-peer/

multiplier) using novaNet log ■ Fast reaction times due to data transmission on an events

basis ■ Control modules pre-addressed in the factory with

integrated lightning protection and battery-buffered RAM modules

■ No onsite engineering (binding) required

DigiNet operator terminals

DigiMaster DM5Pre-programmed Plug-&-Play operator terminal with graphic user interface, consisting of a touch panel with colour display, installed in the door of the zone control panel.

■ Monitoring and setting the DigiNet system (operating modes, temperature values, scheduler, calendar, alarm handling, control parameters)

DigiCom DC5Package consisting of operating software, novaNet router and connection cables for using the Hoval DigiNet with a PC:

■ Monitoring and setting the DigiNet system (operating modes, temperature values, scheduler, calendar, alarm handling and forwarding, control parameters)

■ Trend function, data storage and logbook ■ Differentiated password protection

DigiEasy DE5Additional unit for operating a control zone, for installation at any location in a double flush socket box or in the door of the zone control panel:

■ Display of the current room temperature set value ■ Increase or decrease the set value by up to 3 °C ■ Acknowledge alarms ■ Switch the operating mode

Options ■ Window for DigiMaster ■ IP65 framework ■ novaNet socket ■ novaNet router ■ 4 special functions with switch ■ 8 special functions with 2 switches ■ Special function on terminal ■ DigiEasy installation

DigiNet zone control panelThe zone control panel (coated sheet steel, RAL 7035) contains:

■ 1 fresh air sensor ■ 1 transformer 230/24 V ■ 2 circuit breakers for transformer (1-pin) ■ 1 relay ■ 1 safety relay (2-pin, external) ■ Input and output terminals (top) ■ 1 wiring diagram of the system ■ 1 DigiZone controller, 1 relay and 1 room air sensor

(included) for each control zone

DigiZone controller DZ5Control unit for each control zone, integrated in the zone control panel:

■ Processes the following inputs: room and fresh air tempe-rature, trouble heating and special functions (optional)

■ Controls the operating modes according to the scheduler ■ Sets the outputs for the enable heating and the collective

trouble indicator

Options ■ Alarm lamp ■ Socket ■ Control of the main pump ■ 2-pin circuit breakers ■ Power supply for indoor climate units with integrated

DigiUnit controller ■ Integration of indoor climate units without integrated

DigiUnit controller ■ Room temperature average value ■ DigiPlus controller ■ Humidity sensor ■ CO2 sensor ■ Base

RoofVent® LHW

Specification texts

RoofVent® LKWSupply and extract air handling unit with energy recovery for heating and cooling high spaces

C

1 Use ______________________________36

2 Construction and operation____________36

3 Technical data ______________________43

4 Design example _____________________52

5 Options ___________________________54

6 Control systems_____________________55

7 Transport and installation _____________56

8 Specification texts ___________________60

RoofVent® LKW

Content

36

1 Use

1.1 Intended use

RoofVent® LKW units are used to supply fresh air and to remove extract air as well as for heating and cooling coupled with energy recovery in high spaces. Also included under intended use are compliance with the installation, commis-sioning, operating and maintenance provisions (operating manual).Any use beyond this is considered improper use. The manufacturer shall not be held responsible for any damage resulting from such use.

1.2 User group

RoofVent® LKW units may only be installed, operated and serviced by authorised and trained specialists who are fami-liar with the equipment and aware of the dangers involved.The operating manual is for English-speaking operating engineers and technicians as well as specialists in building, heating and ventilation technology.

1.3 Risks

RoofVent® LKW units are built to correspond to the state of the art and to the latest safety standards. However, despite all precautionary measures taken, there are still some poten-tial hazards which are not immediately obvious, such as:

■ Dangers when working with the electrical systems ■ Parts (e.g. tools) can fall down below when working on the

ventilation unit. ■ Dangers when working on the roof ■ Damage to devices or components due to lightning ■ Malfunctions as a result of defective parts ■ Hazards from hot water when working on the hot water

supply ■ Ingress of water through the roof unit if the access panels

are not closed correctly


The RoofVent® LKW is used for ventilating, heating and cooling large areas (production halls, shopping centres, sports halls, exhibition halls, etc.). It fulfils the following functions:

■ Heating (with connection to central hot water supply) ■ Cooling (with connection to chilled water system) ■ Fresh air supply ■ Extract air removal ■ Recirculation ■ Energy recovery ■ Air distribution via Air-Injector ■ Air filtration

A ventilation system consists of several autonomous RoofVent® LKW units and, as a rule, works without supply and extract air ducts. The units are decentrally installed in the roof and are also serviced from roof level.Thanks to their high output and efficient air distribution, RoofVent® LKW units have a large operating range. This means that compared with other systems, only few units are necessary to create the required conditions.Three unit sizes, various coil types and a series of accesso-ries make it possible to provide a customised solution for any hall.


The RoofVent® LKW consists of the following components: ■ Roof unit with energy recovery:

self-supporting casing made of Aluzinc sheet steel, insu-lated inside (class B1)

■ Filter box: available in three standard lengths per unit size for adjust-ment to specific dimensional requirements

■ Heating/cooling section: coil connections possible on each side (usually under-neath the extract air grille)


The unit is delivered in two sections: above-roof unit and below-roof unit (see Fig. C1). The components are bolted together and can be dismantled individually.

RoofVent® LKW

Use

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The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air. The air is therefore blown into the room vertically downward, conically or horizontally. This ensures that:

■ each RoofVent® LKW ventilates, heats and cools a large floor area,


saving energy.

Above-roof unit: Roof unit with energy recovery

Below-roof unit:a Filter boxb Heating/cooling sectionc Air-Injector

Fig. C1: Components of the RoofVent® LKW

a

b

c

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Actuator Air-Injector:adjusts the supply air discharge direction continuously from vertical to horizontal

Condensate connection

Frost controller

Extract air grille

Extract air filter:bag filter with differential pressure switch for filter monitoring

ER damper and bypass damper:opposed dampers for regulation of energy recovery, with actuator

Access panel:access to extract air filter

Weather louvre door:access to the fresh air filter and to the DigiUnit terminal box

Fresh air filter:bag filter with differential pressure switch for filter monitoring

Fresh air damper and recirculation damper:opposed dampers for switching between fresh air and recirculation operation, with actuator

Gravity damper:closes the bypass during shutdown and thus prevents heat loss

Exhaust air fan:twin impeller centrifugal fan with maintenance-free drive

Exhaust air grille:access to exhaust air fan

Plate heat exchanger:with bypass for energy recovery control and condensate drain

Access panel:access to supply air fan

Supply air fan:twin impeller centrifugal fan with maintenance-free drive

Access panel: access to the heating/cooling coil

Heating/cooling coil:LPHW/LPCW coil consisting of copper tubes with aluminium fins

Condensate separator

Fig. C2: Components of the RoofVent® LKW

RoofVent® LKW


40




Plate heat exchanger

Supply air fan


Heating/cooling coil LPHW/LPCW

Frost controller


Supply air sensor



Extract air sensor



ER/bypass damper with actuator

Gravity damper

Exhaust air fan



Fig. C3: Operational diagram, RoofVent® LKW

RoofVent® LKW


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2.3 Operating modes

The RoofVent® LKW has the following operating modes: ■ Off ■ Ventilation ■ Ventilation (reduced) ■ Recirculation ■ Recirculation night








Supply air fan ................... OffExhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. ClosedRecirculation damper ....... OpenHeating/cooling ................ Off

VE2 VentilationThe RoofVent® unit blows fresh air into the room and draws off spent room air. Heating/cooling and energy recovery are controlled on the basis of heating/cooling demand and temperature conditions.The room temperature set value day is active.

During room use Supply air fan ................... OnExhaust air fan ................. OnEnergy recovery ............... 0 – 100 %Fresh air damper .............. OpenRecirculation damper ....... ClosedHeating/cooling ................ 0 - 100 %



REC RecirculationOn/Off operation: When heating or cooling is required, the RoofVent® unit draws in room air, heats or cools it and blows it back into the room.The room temperature set value day is active.

For pre-heating and pre-cooling

Supply air fan ................... On *)

Exhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. ClosedRecirculation damper ....... OpenHeating/cooling ................ On *)

*) during heat or cool demandRECN Recirculation night

Like REC, but with room temperature set value night


RoofVent® LKW


42



For special cases Supply air fan ................... OffExhaust air fan ................. OnEnergy recovery ............... 0 %Fresh air damper .............. OpenRecirculation damper ....... ClosedHeating/cooling ................ Off

SA Supply airThe RoofVent® unit blows fresh air into the room. Heating/cooling is controlled on the basis of the heating/cooling demand and temperature conditions.Spent room air passes through open windows and doors or another system provides extraction.The room temperature set value day is active.

For special cases Supply air fan ................... OnExhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. OpenRecirculation damper ....... ClosedHeating/cooling ................ 0 - 100 %



Supply air fan ................... On *)


Energy recovery ............... 0 %Fresh air damper .............. Open *)


Heating/cooling ................ Off




Supply air fan ................... OnExhaust air fan ................. OffEnergy recovery ............... 0 %Fresh air damper .............. ClosedRecirculation damper ....... OpenHeating/cooling ................ On


Table C1: Operating modes of the RoofVent® LKW

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3 Technical data


Below-roof unit

LKW - 9 / DN5 / LW + F00 - K.C - D / ...

Unit typeRoofVent® LKW

Unit size6, 9 or 10

ControlDN5 Design for DigiNet 5KK Design for non-Hoval control

Roof unitRoof unit with energy recovery


Heating/cooling sectionK.C Heating/cooling section with coil type CK.D Heating/cooling section with coil type D

Air-Injector

Options

Table C2: Unit type reference


Unit type LKW-6 LKW-9 LKW-10

Extract air temperature max. °C 50 50 50

Extract air relative humidity max. % 60 60 60

Moisture content of extract air 1) max. g/kg 12.5 12.5 12.5

Fresh air temperature 2) min. °C -30 -30 -30

Heating medium temperature max. °C 120 120 120

Operating pressure max. kPa 800 800 800

Supply air temperature max. °C 60 60 60

Minimum operating time VE2 min. min 30 30 30

Amount of condensate max. kg/h 60 150 150

Air flow rate min. m³/h 3100 5000 5000

Table C3: Application limits of the RoofVent® LKW

RoofVent® LKW

Technical data

44



Air distribution Nominal air flow rate 1) Supply air m³/h 5000 7650 8400

Exhaust air m³/h 5000 7650 8400

Floor area reached Max. m² 426 748 855

Energy recovery Heat recovery efficiency, dry % 60 63 57

Heat recovery efficiency, wet % 68 73 65

Fan characteristics Supply voltage V AC 3 x 400 3 x 400 3 x 400

Permitted voltage tolerance % ± 10 ± 10 ± 10


Active power per motor kW 1.8 3.0 4.5

Current consumption A 3.9 6.0 9.9

Set point of thermal relays A 4.6 7.5 11.4

Speed of rotation (nominal) rpm 1440 1464 1450

Actuators Supply voltage V AC 24 24 24


Control voltage V DC 2…10 2…10 2…10

Torque Nm 10 10 10

Run time for 90° rotation s 150 150 150

Filter monitoring Factory setting of differential pressure switch Pa 300 300 3001) Refers to: RoofVent® LKW with heating/cooling coil type C and vertical supply air discharge direction

Table C4: Technical data, RoofVent® LKW

3.4 Sound levels

Unit type LKW-6 LKW-9 LKW-10Operating mode VE2 REC VE2 REC VE2 RECPosition

Sound pressure level (at a distance of 5 m) 1) dB (A) 46 60 58 47 46 52 66 57 49 48 54 68 60 52 51

Total sound power level dB (A) 68 82 80 69 68 74 88 79 71 70 76 90 82 74 73

Octave sound power level 63 Hz dB (A) 51 63 62 48 54 52 69 59 54 56 54 71 62 57 59

125 Hz dB (A) 55 71 70 56 63 63 78 70 60 63 65 80 73 63 662) 250 Hz dB (A) 61 76 74 64 63 65 81 71 63 66 67 83 74 66 69

500 Hz dB (A) 61 75 71 61 58 66 81 70 62 61 68 83 73 65 64

1000 Hz dB (A) 65 77 72 63 57 71 81 72 67 60 73 83 75 70 63

2000 Hz dB (A) 57 72 72 60 56 66 80 73 64 58 68 82 76 67 61

4000 Hz dB (A) 49 71 71 57 48 58 76 71 58 50 60 78 74 61 53

8000 Hz dB (A) 36 65 63 49 42 44 70 62 51 41 46 72 65 54 44

1) with hemispherical radiation in a low-reflection environment2) outdoors (roof unit)

Table C5: Sound levels, RoofVent® LKW

RoofVent® LKW

Technical data

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3.5 Heat output

Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the performance data for other design data. You can download 'HK-Select' free of charge on the Internet.

Fresh air temperature -5 °C -15 °CLPHW Size Type Q QTG Hmax tS ∆pW mW Q QTG Hmax tS ∆pW mW

°C kW kW m °C kPa l/h kW kW m °C kPa l/h

80/60 LKW-6 C 75 60 8.6 52 12 3210 79 59 8.7 51 13 3399

60/40 LKW-6 C 47 33 11.3 36 5 2035 52 32 11.5 36 6 2225

80/60 LKW-9 C 112 93 9.2 53 10 4823 118 91 9.3 52 11 5070

LKW-9 D – – – – – – – – – – – –

60/40 LKW-9 C 70 51 12.1 37 4 3020 76 49 12.4 36 5 3269

LKW-9 D 86 67 10.7 42 5 3680 93 66 10.8 42 6 3977

80/60 LKW-10 C 125 98 10.2 51 12 5347 133 95 10.4 50 13 5684

LKW-10 D 151 124 9.2 60 13 6481 161 124 9.2 60 14 6887

60/40 LKW-10 C 80 53 13.7 36 5 3414 87 50 14.0 35 7 3753

LKW-10 D 98 71 11.9 42 6 4192 107 70 12.0 41 7 4601

Legend: Type = Type of heating/cooling coilQ = Heat outputQTG = Output to cover fabric heat lossesHmax = Maximum mounting heighttS = Supply air temperature∆pW = Water pressure dropmW = Water flow rate

Refers to: Room air 18 °C, extract air 20 °C/40 % rel. humidity

— These operating conditions are not permissible, because the maximum supply air temperature of 60 °C is exceeded.

Table C6: Heat output, RoofVent® LKW

Note The output for coverage of the fabric heat losses (QTG) allows for the ventilation heat requirement (QV) and the energy recovery output (QER) under the respective air conditions. It is calculated as follows: QTG = Q + QER – QV

RoofVent® LKW

Technical data

46

3.6 Cooling capacities

Cooling medium temperature 6/12 °C 8/14 °CtF rhF Size Type Qsen Qtot QTG tS ∆pW mW mC Qsen Qtot QTG tS ∆pW mW mC

°C % kW kW kW °C kPa l/h kg/h kW kW kW °C kPa l/h kg/h

28 40 LKW-6 C 19 21 13 15 13 3065 3 17 17 11 16 8 2403 0

60 LKW-6 C 18 36 12 15 33 5084 24 16 29 10 17 23 4199 19

32 40 LKW-6 C 24 33 18 16 29 4761 13 22 27 16 17 20 3877 7

60 LKW-6 C – – – – – – – 21 46 14 18 51 6529 35

28 40 LKW-9 C 29 32 20 15 11 4553 4 25 25 16 16 7 3618 0

LKW-9 D 36 42 27 12 14 6047 10 31 31 22 14 8 4448 0

60 LKW-9 C 27 54 19 15 28 7753 38 24 45 15 17 20 6396 29

LKW-9 D 35 70 26 12 35 10067 50 30 59 21 14 25 8405 40

32 40 LKW-9 C 37 51 28 16 26 7315 20 33 42 24 17 18 5960 12

LKW-9 D 45 66 36 13 32 9510 30 41 55 31 14 22 7848 21

60 LKW-9 C 35 79 26 17 57 11375 63 31 70 22 18 44 9979 55

LKW-9 D 44 102 35 13 69 14630 82 39 90 30 15 54 12941 72

28 40 LKW-10 C 32 34 21 15 12 4879 3 28 28 17 16 8 3959 0

LKW-10 D 40 46 29 12 16 6551 9 34 34 23 14 9 4906 0

60 LKW-10 C 30 58 19 16 32 8339 40 26 48 16 17 23 6891 31

LKW-10 D 38 76 28 13 41 10953 54 33 64 23 14 29 9157 43

32 40 LKW-10 C 40 54 29 16 29 7801 21 36 44 26 18 20 6357 12

LKW-10 D 50 72 39 13 36 10262 32 45 59 34 15 25 8466 21

60 LKW-10 C 37 85 27 17 64 12183 67 34 75 23 18 50 10691 58

LKW-10 D 48 111 37 13 79 15866 89 43 98 32 15 63 14036 78

Legend: tF = Temperature of the fresh airrhF = Relative humidity of the fresh airType = Type of cooling coilQsen = Sensible cooling capacityQtot = Total cooling capacity

QTG = Output for coverage of fabric cooling losses (→ sensible cooling load)tS = Supply air temperature∆pW = Water pressure dropmW = Water flow ratemC = Amount of condensate

Refers to: ■ At fresh air temperature 28 °C: room air 22 °C, extract air 24 °C/50 % rel. humidity ■ At fresh air temperature 32 °C: room air 26 °C, extract air 28 °C/50 % rel. humidity

— These operating conditions are not permissible, because the maximum condensate quantity of 60 kg/h is exceeded.

Table C7: Cooling capacity, RoofVent® LKW

Note The output for coverage of fabric cooling losses (QTG) allows for the ventilation cooling require-ment (QV) and the output of the energy recovery (QER) under the respective air conditions. It is calculated as follows: QTG = Qsen + QER – QV

RoofVent® LKW

Technical data

47

B

C

E

E

F

G

H

I

J

K

L

M

N


X/2 X

Y

Unit type LKW-6 LKW-9 LKW-10 Align the RoofVent® units so that no unit draws in the exhaust air from another unit as fresh air.


Provide a clear space of approx. 1.5 m on the side opposite to the coil connections for service and main-tenance.


Unit clearance X Min. m 11 13 14

Max. m 21 27 29

Mounting height Y 1) Min. 1) m 4.0 5.0 5.0



values, see Table C6).

Table C8: Minimum and maximum distances

RoofVent® LKW

Technical data

48


Roof unit LW


Cable feedthroughs

Access panel

Heating/cooling section K

Air-Injector D

Return

Flow


Fig. C4: Dimensional drawing for RoofVent® LKW (dimensions in mm)

80

RoofVent® LKW

Technical data

49

B

C

E

E

F

G

H

I

J

K

L

M

N



A mm 2100 2400 2400

B mm 1080 1380 1380

C mm 1390 1500 1500

D mm 600 675 675

E mm 1092 1392 1392


Filter box design F00 F25 F50 F00 F25 F50 F00 F25 F50

G mm 940 1190 1440 980 1230 1480 980 1230 1480

S mm 2050 2300 2550 2160 2410 2660 2160 2410 2660

H mm 530 780 1030 530 780 1030 530 780 1030

F mm 1000 1240 1240

J mm 410 450 450

K mm 848 1048 1048

M mm 620 610 610

O mm 767 937 937

P mm 758 882 882

Q mm 490 570 570

R mm 900 1100 1100

V mm 500 630 630

W mm 54 53 53

Coil type C C D C D

N mm 123 92 83 92 83

Y mm 78 78 95 78 95

Heating coil data Water content l 6.2 9.4 14.2 9.4 14.2



Pipe thr. 2 (female)



Weights Roof unit kg 403 577 577 565 565

Below-roof unit (with F00) kg 170 240 259 240 259

Filter box F00 kg 63 82 82 82 82

Heating/cooling section kg 70 102 121 102 121

Air-Injector kg 37 56 56 56 56

Total (with F00) kg 573 817 836 805 824

Filter box F25 1) kg + 11 + 13 + 13 + 13 + 13

Filter box F50 1) kg + 22 + 26 + 26 + 26 + 261) Additional weight compared to the design with filter box F00

Table C9: Dimensions and weights, RoofVent® LKW

RoofVent® LKW

Technical data

50



LKW-6

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 0 6 0 0 5 5 0 0 0 5 0 0 5 4 0 0 0 4

Supply air



Diagram C1: Air flow rate, RoofVent® LKW-6 with additional pressure drops


LKW-9

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 5 8 0 0 0 8 0 0 5 7 0 5 6 7 0 0 0 7 0 0 5 6

Supply air



RoofVent® LKW

Technical data

51

B

C

E

E

F

G

H

I

J

K

L

M

N


LKW-10

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 0 9 0 0 5 8 0 0 4 8 0 0 0 8 0 0 5 7 0 0 0 7

Supply air



RoofVent® LKW

Technical data

52

4 Design example

Note The following design example relates to cooling mode. The design rating for heating mode can be performed analogously to the design example above in Part B 'RoofVent® LHW.'

Design data ■ Required fresh air flow rate or air change rate ■ Hall geometry (length, width, height) ■ Design conditions ■ Desired room temperature (in the occupied area) ■ Extract air conditions 1)

■ Cooling load ■ Cooling medium

1) The extract air temperature is generally higher than the temperature in the occupied area. This is the result of unavoidable temperature stratifica-tion in high spaces, but is reduced to a minimum with the Air-Injector. A temperature gradient of only 0.2 K per metre hall height can therefore be assumed.

ExampleFresh air flow rate ......................................75'000 m³/hHall geometry (L x W x H) .................... 72 x 60 x 10 mDesign conditions .................................... 32 °C / 40 %Desired room temperature...................................26 °CExtract air conditions ................................. 28 °C/50 %Cooling load..................................................... 200 kWCooling medium.................................... LPCW 8/14 °C

Room temperature:..............................................26 °CTemperature gradient: .................................. 10 · 0.2 KExtract air temperature: ....................................= 28 °C

Required number of units nreqBased on the air flow rate per unit (see Table C4), select a trial unit size. (Depending on the results of further calcu-lations, repeat the layout design for another unit size if necessary.)

nreq = Vreq / VU

Vreq = required fresh air flow rate in m³/hVU = air flow rate for the selected unit size in m³/h

Approximate selection: Unit size LKW-10

nreq = 75'000 / 8'400nreq = 8.93

Select 9 LKW-10s.


V = n · VU


V = 9 · 8'400V = 75'600 m³/h

Necessary output to cover fabric cooling losses (sensible cooling capacity) per unit QTG (in kW)

QTG = QTeff / n

QTG = 200 / 9QTG ≈ 22 kW

Selection of coil typeFrom Table C7, select the required coil type based on the necessary output to cover fabric heat losses per unit.

Note Note that the total cooling capacity Qtot must be used for dimensioning of the chiller.

Select coil type C with 26 kW capacity to cover fabric cooling losses at LPCW 8/14 °C and a fresh air tempera-ture of 32 °C / 40 %.

RoofVent® LKW

Design example

53

B

C

E

E

F

G

H

I

J

K

L

M

N

Checking the ancillary conditions ■ Maximum floor area reached Calculate the floor area reached per unit using the selected number of units. If it exceeds the maximum value listed in Table C4, increase the number of units.

■ Compliance with minimum and maximum distances Check the resulting distances based on the hall geometry and arrangement of the units, using the information in Table C8.




Select 9 LKW-10s with coil type C. They guarantee cost-effective and energy-saving operation.

RoofVent® LKW

Design example

54

5 Options

RoofVent® LKW units can be adapted to the requirements of the specific project with a series of options. You will find a detailed description of all optional components in Part J 'Options' of this handbook.

Option Use

ColdClimate design For installation of the RoofVent® unit in areas where the fresh air temperatures fall below –30 °C

Oil-proof design When using the RoofVent® unit in applications with high oil content in the extract air



High-pressure fan, supply air To overcome additional external pressure drop (e.g. from supply air ducts installed on-site)

High-pressure fan, exhaust air To overcome additional external pressure drop (e.g. from extract air ducts installed on-site)











Drop eliminator To drain condensate from the plate heat exchanger onto the roof

Condensate pump To drain condensate from the condensate separator through waste water pipes directly below the ceiling or onto the roof

Heating and cooling in the 4-pipe system

Additional heating section for 2 completely separate hydraulic circuits


Table C10: Availability of options for RoofVent® LKW

RoofVent® LKW

Options

55

B

C

E

E

F

G

H

I

J

K

L

M

N

6 Control systems

There are basically two possibilities for controlling the RoofVent® LKW:

System Description

Hoval DigiNet We strongly advise that the RoofVent® LKW should be cont-rolled by Hoval DigiNet. This control system, developed speci-fically for Hoval indoor climate systems, offers the following advantages:




■ DigiNet regulates the energy recovery output in the plate heat exchanger.

■ The ready-to-connect units with integrated control compo-nents are easy to plan and install.

■ Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules.


Non-Hoval system RoofVent® LKWs can also be controlled with non-Hoval systems. However, the non-Hoval system must take the special features of the decentralised systems into account.In the design for non-Hoval control, RoofVent® LKW units are supplied only with a basic terminal box instead of the DigiUnit terminal box. Additional information can be found in the sepa-rate description 'Terminal box unit RoofVent® LKW' (available on request).

Table C11: Control systems, RoofVent® LKW

RoofVent® LKW

Control systems

56


7.1 Assembly


RoofVent® LKW units are delivered in 2 sections (roof unit, below-roof unit) on a wooden pallet. Parts which belong together are labelled with the same unit number.










Fig. C5: RoofVent® roof units are installed from roof level.








The Hoval DigiNet control system switches the Enable heating on for 1 minute once a week. This prevents the main pump from blocking after a prolonged shutdown.





Caution Risk of injury from falling parts. Do not apply any loads to the coil, e.g. by means of the flow or return !

Note Use the 'Condensate pump', 'Hydraulic assembly' or 'Magnetic mixing valve' options for quick and easy hydraulic installation.

Condensate drainDimension the slope and cross-section of the condensate line so that no condensate backflow takes place.

RoofVent® LKW


57

B

C

E

E

F

G

H

I

J

K

L

M

N


novaNet system bus

Power supply

Connection box



Fresh air sensor

Room air sensor


Trouble input cooling

Main pump

DigiMaster

Zone control panel

Selector switch heating/cooling

Enable heating

Enable cooling


Heating circuit

Cooling circuit

Fig. C6: Conceptual drawing for hydraulic diverting system

< 2

m

RoofVent® LKW


58


Caution Danger from electric current. Electrical installation must be carried out by a qualified electrician!



wiring diagram (for wiring within the unit, see Fig. C8). ■ Install the system bus for the control systems separately








Power supply

Bus cable

Connection box

Fig. C7: Wiring in unit



Power supply

Bus cable

Connection box

Fig. C8: Wiring in unit

RoofVent® LKW


59

B

C

E

E

F

G

H

I

J

K

L

M

N

Component Description Voltage Cable Option CommentDigiUnit terminal box

Power supply 3 x 400 V LKW-6: 5 x 4 mm²LKW-9: 5 x 6 mm²LKW-10: 5 x 10 mm²


Heating/cooling pump 3 x 400 V 4 x 2.5 mm² For injection system, per pump


Power supply 3 x 400 V 5 x … mm² Depending on optionsnovaNet system bus 2 x 0.16 mm² For bus cable specifications,

see Part K, chap. 2.4Room air sensor 2 x 1.5 mm² Max. 170 m

Shielded cableFresh air sensor 2 x 1.5 mm² Max. 170 mEnable heating Volt-free

Max. 230 V3 x 1.5 mm² 2 A max.

Per zoneEnable cooling Volt-free

Max. 230 V3 x 1.5 mm² 2 A max.

Per zoneTrouble input heating 24 V 3 x 1.5 mm² Per zoneTrouble input cooling 24 V 3 x 1.5 mm² Per zoneCollective trouble indicator Volt-free

Max. 230 V3 x 1.5 mm² Max. 6 A

Special function on terminal 24 V 3 x 1.5 mm² Per special functionPower supply for RoofVent® LKW

3 x 400 V LKW-6: 5 x 4 mm²LKW-9: 5 x 6 mm²LKW-10: 5 x 10 mm²

Per RoofVent® LKW

Main pump 3 x 400 V 4 x 2.5 mm² Per pumpHumidity sensor 24 V 4 x 1.5 mm² Max. 170 mCO2 sensor 24 V 4 x 1.5 mm² Max. 170 m

Variant:


Power supply 1 x 230 V 3 x … mm² Depending on optionsnovaNet system bus 2 x 0.16 mm² For bus cable specifications,

see Part K, chap. 2.4Room air sensor 2 x 1.5 mm² Max. 170 m

Shielded cableFresh air sensor 2 x 1.5 mm² Max. 170 mEnable heating Volt-free

Max. 230 V3 x 1.5 mm² 2 A max.

Per zoneEnable cooling Volt-free

Max. 230 V3 x 1.5 mm² 2 A max.

Per zoneTrouble input heating 24 V 3 x 1.5 mm² Per zoneTrouble input cooling 24 V 3 x 1.5 mm² Per zoneCollective trouble indicator Volt-free

Max. 230 V3 x 1.5 mm² Max. 6 A

Special function on terminal 24 V 3 x 1.5 mm² Per special functionMain pump 1 x 230 V 3 x 1.5 mm² Per pumpHumidity sensor 24 V 4 x 1.5 mm² Max. 170 mCO2 sensor 24 V 4 x 1.5 mm² Max. 170 m

Table C12: Cable list

RoofVent® LKW


60


RoofVent® LKW supply and extract air handling unit, consis-ting of:

■ Roof unit with energy recovery ■ Filter box ■ Heating/cooling section ■ Air-Injector ■ Control systems





■ Opposed fresh air and recirculation dampers with actuator ■ Plate heat exchanger made of aluminium with bypass,

condensate collecting channel and siphon to the roof, including ER and bypass dampers with actuators to regu-late the energy recovery









Type LW-… /DN5


… m³/h

Heat recovery efficiency, dry … %



Frequency 50 Hz





Type F-…

8.3 Heating/cooling section K.C / K.D

Internally insulated Aluzinc sheet steel casing, containing the heating/cooling coil made of copper tubes and aluminium fins, the condensate separator with collecting channel and the frost controller; siphon for connection to a condensate line (included in delivery)

Type K.__-9

Heat output … kW



Cooling capacity … kW

Cooling medium LPCW … °C


At inlet humidity … %

RoofVent® LKW

Specification texts

61

B

C

E

E

F

G

H

I

J

K

L

M

N

8.4 Air-Injector D

Internally-insulated Aluzinc sheet steel casing with: ■ Vortex air distributor with concentric outlet nozzle, adjus-


heating/cooling mixing valve)

Type D -9


8.5 Options

ColdClimate design ■ Cold-resistant materials ■ Fans with downtime heating ■ Valve actuators with spring return and additional heating ■ Heating/cooling coil type X with water-side frost monito-

ring ■ Plate heat exchanger with differential pressure switch

Oil-proof design ■ Oil-proof materials ■ Extract air filter class F5 ■ Condensate drain from the plate heat exchanger to the drip tray in the filter box





frequency converter

High-pressure fan supply air HZMaintenance-free, direct-drive high-pressure fan supply air


Hydraulic assembly diverting system HGPrefabricated assembly for hydraulic diverting system, consisting of magnetic mixing valve, balancing valve, ball valve, automatic air vent and screw connections for connec-tion to the unit and to the distributor circuit; ready-to-connect mixing valve for connection to the connection box; sized for

the respective heating/cooling coil and the Hoval DigiNet control system

Magnetic mixing valve ..HVContinuous regulating valve with magnetic drive, ready for connection to the connection box, sized for the respective heating/cooling coil


Exhaust air silencer FSDAs an attachment to the exhaust air grille, casing consisting of Aluzinc sheet steel with built in sound attenuation splitters, for reducing the noise from the exhaust air grille, insertion attenuation _____ dB




Actuators with spring return SMFModulating actuators with safety function in case of a power failure, mounted and wired on the fresh air damper and ER damper

Air outlet box AKMade of Aluzinc sheet steel, with 4 adjustable exhaust air grilles (replaces the Air-Injector)

Drop eliminator TAConsisting of aluminium fins, fitted in the extract air flow on the air inlet side of the plate heat exchanger, to drain condensate onto the roof

Condensate pump KPConsisting of a centrifugal pump and a drip tray, max. deli-very rate of 150 l/h with a delivery head of 3 m

RoofVent® LKW

Specification texts

62

Heating and cooling in the 4-pipe systemThere is an additional heating section installed in the below-roof unit:

■ Heating section H.A / H.B / H.CAluzinc sheet steel casing, includes the LPHW heating coil made of copper tubes and aluminium fins and the frost controller.

Type H.__-…

Heat output … kW



Design for injection system ESControl and high-voltage section for the heating/cooling pump integrated into the DigiUnit terminal box

8.6 Control systems


















■ 1 fresh air sensor ■ 1 transformer 230/24 V ■ 2 circuit breakers for transformer (1-pin) ■ 1 relay ■ 1 safety relay (2-pin, external) ■ Input and output terminals (top) ■ 1 wiring diagram of the system ■ 1 DigiZone controller, 1 heating/cooling selector switch,

1 relay and 1 room air sensor (supplied) for each control zone


■ Processes the inputs room and fresh air temperature, trouble heating, trouble cooling and special functions (optional)

■ Controls the operating modes according to the scheduler ■ Sets the outputs for the enable heating, enable cooling

and the collective trouble indicator




RoofVent® LKW

Specification texts

RoofVent® LHSupply and extract air handling unit with optimum fresh air rate for heating high spaces

H

1 Use _____________________________ 176

2 Construction and operation___________ 176

3 Technical data _____________________183

4 Design example ____________________192

5 Options __________________________194

6 Control systems____________________195

7 Transport and installation ____________196

8 Specification texts __________________200

RoofVent® LH

Content

176

1 Use

1.1 Intended use

RoofVent® LH units are used to supply fresh air, for the disposal of extract air as well as for heating of high spaces coupled with an optimised fresh air rate. Intended use also includes compliance with the installation, commissioning, operating and maintenance provisions (operating manual).Any use beyond this is considered improper use. The manufacturer shall not be held responsible for any damage resulting from such use.

1.2 User group

RoofVent® LH units may only be installed, operated and maintained by authorized and trained specialists who are familiar with the equipment and aware of the dangers involved.The operating manual is for English-speaking operating engineers and technicians as well as specialists in building, heating and ventilation technology.

1.3 Risks

RoofVent® LH units are built to correspond to the state of the art and to current safety standards. But despite all precauti-onary measures taken, there are still some potential hazards that are not obvious, such as:

■ Dangers when working with the electrical systems ■ During work on the ventilation unit, parts (e.g. tools) can





The RoofVent® LH is used for ventilating and heating large areas (production halls, shopping centres, sports halls, exhi-bition halls etc.). It fulfils the following functions:

■ Heating (with connection to the central boiler system) ■ Fresh air supply ■ Extract air removal ■ Recirculation ■ Mixed air operation ■ Air distribution via Air-Injector ■ Air filtration

A ventilation system consists of several autonomous RoofVent® LH units and, as a rule, works without supply and extract air ducts. The units are decentrally installed in the roof and are also serviced from roof level.Thanks to their high output and efficient air distribution, RoofVent® LH units have a large operating range. This means that compared with other systems, only few units are necessary to create the required conditions.The units make use of the extract air energy in mixed air operation. The DigiNet control system constantly optimises the fresh air rate: Only as much fresh air is taken in as is necessary to maintain the room temperature without additi-onal heating. A minimum value can be set.


The RoofVent® LH consists of the following components: ■ Roof unit:


■ Filter box: available in three standard lengths per unit size for adjustment to specific dimensional requirements

■ Heating section: coil connections possible on each side (usually under-neath the extract air grille)


The unit is delivered in two sections: roof unit and below-roof unit (see Fig. H1). The components are bolted together and can be dismantled individually.

RoofVent® LH

Use

177

E

E

F

G

H

J

J

K

L

M

N


The patented air distributor – called the Air-Injector – is the core element. The air discharge angle is set by means of the adjustable guide vanes. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air. The air is therefore blown into the room vertically downward, conically or horizontally. This ensures that:

■ a large floor area is ventilated and heated by each RoofVent® LH,


saving energy.

Above-roof unit: Roof unit

Below-roof unit:a Filter boxb Heating sectionc Air-Injector

Fig. H1: Components of the RoofVent® LH

a

bc

RoofVent® LH


178

RoofVent® LH

Use

179

E

E

F

G

H

J

J

K

L

M

N



Access panel: access to heating coil



Gravity damper: opens in recirculation operation due to underpressure on the supply air side



Fresh air damper: with actuator

Recirculation damper: opposed to the fresh air and exhaust air damper

Exhaust air damper





Extract air grille

Heating coil: LPHW coil consisting of copper tubes with aluminium fins

Fig. H2: Components of the RoofVent® LH

RoofVent® LH


180




Supply air fan


LPHW heating coil

Frost controller

Supply air sensor



Extract air sensor


Gravity damper

Exhaust air fan


Exhaust air damper (linked with the fresh air damper)


Fig. H3: Operational diagram, RoofVent® LH

RoofVent® LH


181

E

E

F

G

H

J

J

K

L

M

N

2.3 Operating modes

The RoofVent® LH has the following operating modes: ■ Off ■ Ventilation ■ Ventilation (reduced) ■ Recirculation ■ Recirculation night








Supply air fan ................... OffExhaust air fan ................. OffFresh air damper .............. ClosedRecirculation damper ....... OpenHeating ............................ Off

VE2 VentilationThe RoofVent® unit blows fresh air into the room and draws off spent room air. The heating and the fresh air rate are controlled depending on the heat demand and the temperature conditions.The room temperature set value day is active.

During room use Supply air fan ................... OnExhaust air fan ................. OnFresh air damper .............. 0 - 100 % *)

Recirculation damper ....... 0 - 100 % *)

Heating ............................ 0 - 100 % *)

*) depending on heat demand and set minimum fresh air rate



REC RecirculationOn/Off operation: In the event of heat demand, the RoofVent® unit draws in room air, warms it and blows it back into the room.The room temperature set value day is active.

For pre-heating Supply air fan ................... On *)

Exhaust air fan ................. OffFresh air damper .............. ClosedRecirculation damper ....... OpenHeating ............................ On *)

*) during heat demand

RECN Recirculation nightLike REC, but with room temperature set value night


RoofVent® LH


182



For special cases Supply air fan ................... OffExhaust air fan ................. OnFresh air damper .............. OpenRecirculation damper ....... ClosedHeating ............................ Off

SA Supply airThe RoofVent® unit blows fresh air into the room. Heating is controlled depen-ding on the heat demand and tempera-ture conditions.Spent room air passes through open windows and doors or another system provides extraction.The room temperature set value day is active.

For special cases Supply air fan ................... OnExhaust air fan ................. OffFresh air damper .............. OpenRecirculation damper ....... ClosedHeating ............................ 0 – 100 %



Supply air fan ................... On *)


Fresh air damper .............. Open *)


Heating ............................ Off




Supply air fan ................... OnExhaust air fan ................. OffFresh air damper .............. ClosedRecirculation damper ....... OpenHeating ............................ On


Table H1: Operating modes of the RoofVent® LH

RoofVent® LH


183

E

E

F

G

H

J

J

K

L

M

N

3 Technical data


Below-roof unit

LH - 6 / DN5 / L + F00 - H.B - D / ...

Unit typeRoofVent® LH

Unit size6 or 9

ControlDN5 Design for DigiNet 5KK Design for non-Hoval controls

Roof unitRoof unit


Heating section and coil typeH.A Heating section with coil type AH.B Heating section with coil type BH.C Heating section with coil type C

Air-Injector

Options

Table H2: Unit type reference


Extract air temperature max. 50 °C

Extract air relative humidity max. 60 %

Moisture content of extract air max. 17 g/kg

Fresh air temperature min. -30 °C

Heating medium temperature max. 120 °C

Operating pressure max. 800 kPa

Supply air temperature max. 60 °C

Minimum operating time VE2 min. 30 min

Table H3: Application limits of the RoofVent® LH

RoofVent® LH

Technical data

184


Unit type LH-6 LH-9Air distribution Nominal air flow rate 1) Supply air m³/h 5500 8000

Exhaust air m³/h 5500 8000

Floor area reached Max. m² 484 784

Fan characteristics Supply voltage V AC 3 x 400 3 x 400

Permitted voltage tolerance % ± 10 ± 10

Frequency Hz 50 50

Active power per motor kW 1.8 3.0

Current consumption A 3.9 6.0

Set point of thermal relays A 4.6 7.5

Speed of rotation (nominal) rpm 1440 1464

Actuators Supply voltage V AC 24 24

Frequency Hz 50 50

Control voltage V DC 2…10 2…10

Torque Nm 10 10

Run time for 90° rotation s 150 150

Filter monitoring Factory setting of differential pressure switches Pa 300 3001) Refers to: RoofVent® LH with heating coil type B and vertical supply air discharge direction

Table H4: Technical data, RoofVent® LH

3.4 Sound levels

Unit type LH-6 LH-9Operating mode VE2 REC VE2 RECPosition

Sound pressure level (at a distance of 5 m) 1) dB (A) 63 54 48 64 57 49

Total sound power level dB (A) 85 76 70 86 79 71

Octave sound power level 63 Hz dB (A) 56 45 53 57 48 54

125 Hz dB (A) 64 53 60 65 56 61

250 Hz dB (A) 74 67 64 75 70 65

500 Hz dB (A) 79 72 62 80 75 63

1000 Hz dB (A) 79 71 65 80 74 66

2000 Hz dB (A) 78 67 61 79 70 62

4000 Hz dB (A) 73 63 52 74 66 53

8000 Hz dB (A) 68 56 49 69 59 50

1) with hemispherical radiation in a low-reflection environment

Table H5: Sound levels, RoofVent® LH

RoofVent® LH

Technical data

185

E

E

F

G

H

J

J

K

L

M

N

3.5 Heat output

Temperature of the fresh air°C 0 -5 -10 -15 -20

of the extract air 18 14 13 12 11 10

20 16 15 14 13 12

22 18 17 16 15 14

24 19 18 17 16 15

26 21 20 19 18 17

Air inlet temperature at the heating coil (with 20 % fresh air)

Table H6: Temperature change through intermixing of recirculation air (all values in °C)

Unit size 6

tAI 10 °C 15 °C 20 °CLPHW Size Type Q Hmax tS ∆pW mW Q Hmax tS ∆pW mW Q Hmax tS ∆pW mW

°C kW m °C kPa l/h kW m °C kPa l/h kW m °C kPa l/h

90/70 LH-6 A 44 14.1 33 9 1900 40 13.0 36 8 1800 37 11.9 40 7 1600

LH-6 B 57 11.9 40 15 2500 53 11.3 43 13 2300 48 10.7 46 11 2100

LH-6 C 92 9.2 58 10 4100 84 9.0 60 9 3700 77 9.0 60 8 3400

80/60 LH-6 A 37 16.2 29 7 1600 33 14.1 33 6 1500 30 13.0 36 5 1300

LH-6 B 48 13.3 35 11 2100 44 12.4 38 10 1900 39 11.7 41 8 1700

LH-6 C 78 10.0 51 8 3400 71 9.9 52 7 3100 63 9.6 54 5 2800

70/50 LH-6 A 30 18.8 26 5 1300 27 16.2 29 4 1200 23 14.1 33 3 1000

LH-6 B 39 15.0 31 8 1700 35 13.7 34 7 1500 30 13.0 36 5 1300

LH-6 C 64 11.3 43 6 2800 56 10.9 45 5 2500 49 10.6 47 4 2200

60/40 LH-6 A 22 25.0 22 3 1000 18 20.0 25 2 800 14 16.9 28 1 600

LH-6 B 30 18.8 26 5 1300 26 16.2 29 4 1100 20 15.0 31 3 900

LH-6 C 49 13.0 36 4 2100 40 12.7 37 3 1800 32 12.7 37 2 1400

82/71 LH-6 A 42 14.5 32 25 3400 39 13.0 36 22 3100 36 12.2 39 19 2900

LH-6 B 56 12.2 39 41 4500 51 11.5 42 35 4100 47 10.9 45 30 3700

LH-6 C 88 9.4 56 27 7000 80 9.2 58 23 6500 73 9.0 60 20 5900

Legend: tAI = Air inlet temperature at the heating coilType = Type of heating coilQ = Heat outputHmax = Maximum mounting height (at room temperature 18 °C)

tS = Supply air temperature∆pW = Water pressure dropmW = Water flow rate

Table H7: Heat output, RoofVent® LH-6

RoofVent® LH

Technical data

186

Unit size 9

tAI 10 °C 15 °C 20 °CLPHW Size Type Q Hmax tS ∆pW mW Q Hmax tS ∆pW mW Q Hmax tS ∆pW mW


90/70 LH-9 A 70 13.7 35 3 3100 65 12.5 39 3 2900 59 11.8 42 2 2600

LH-9 B 93 11.3 44 5 4100 86 11.0 46 5 3800 78 10.5 49 4 3500

LH-9 C 136 9.3 59 8 6000 125 9.2 60 7 5500 114 9.2 60 6 5000

80/60 LH-9 A 59 15.4 31 2 2600 53 14.1 34 2 2300 48 12.7 38 2 2100

LH-9 B 78 12.7 38 4 3400 71 12.0 41 3 3100 63 11.3 44 3 2800

LH-9 C 115 10.2 51 7 5000 104 10.0 53 5 4600 94 9.8 55 5 4100

70/50 LH-9 A 47 18.2 27 2 2100 41 16.0 30 1 1800 34 14.5 33 1 1500

LH-9 B 63 14.5 33 3 2700 56 13.7 35 2 2400 48 12.7 38 2 2100

LH-9 C 94 11.3 44 5 4100 83 11.0 46 4 3600 73 10.8 47 3 3200

60/40 LH-9 A 30 25.0 21 1 1300 24 22.0 24 1 1000 18 18.2 27 1 800

LH-9 B 44 19.3 26 2 1900 34 17.4 28 1 1500 24 16.6 29 1 1100

LH-9 C 72 13.3 36 3 3100 59 13.0 37 2 2600 46 13.0 37 1 2000

82/71 LH-9 A 69 13.7 35 9 5500 63 12.7 38 8 5100 57 12.0 41 7 4600

LH-9 B 91 11.5 43 15 7300 83 11.2 45 13 6700 76 10.7 48 11 6100

LH-9 C 130 9.5 57 22 10400 119 9.4 58 19 9500 108 9.2 60 16 8700

Legend: tAI = Air inlet temperature at the heating coilType = Type of heating coilQ = Heat outputHmax = Maximum mounting height (at room temperature 18 °C)

tS = Supply air temperature∆pW = Water pressure dropmW = Water flow rate

Table H8: Heat output, RoofVent® LH-9

RoofVent® LH

Technical data

187

E

E

F

G

H

J

J

K

L

M

N


X/2 X

Y

Unit type LH-6 LH-9 Align the RoofVent® units so that no unit draws in the exhaust air from another unit as fresh air.


Provide a clear space of approx. 1.5 m on the side opposite to the heating coil connections for service and maintenance.


Unit clearance X Min. m 11.0 13.0

Max. m 22.0 28.0

Mounting height Y 1) Min. 1) m 4.0 5.0



values, see Table H7, Table H8).

Table H9: Minimum and maximum distances

RoofVent® LH

Technical data

188


Roof unit L


Heating section H

Air-Injector D

Access panel

Cable feedthroughs for electrical connections

Flow

Return

Fig. H4: Dimensional drawing for RoofVent® LH (dimensions in mm)

RoofVent® LH

Technical data

189

E

E

F

G

H

J

J

K

L

M

N

Unit type LH-6 LH-9


A mm 2100 2400

B mm 1080 1380

C mm 1390 1500

D mm 600 675

E mm 1092 1392


Filter box design F00 F25 F50 F00 F25 F50

G mm 940 1190 1440 980 1230 1480

S mm 1700 1950 2200 1850 2100 2350

H mm 530 780 1030 530 780 1030

F mm 980 1240

J mm 410 450

K mm 848 1048

M mm 270 300

N mm 101 111

O mm 767 937

P mm 758 882

Q mm 490 570

R mm 900 1100

V mm 500 630

Heating coil data Coil type A B C A B C

Water content l 3.1 3.1 6.2 4.7 4.7 9.4



Weights Roof unit kg 363 482

Below-roof unit (with F00) kg 130 130 137 182 182 192

Filter box F00 kg 63 82

Heating section kg 30 30 37 44 44 54

Air-Injector kg 37 56

Total (with F00) kg 493 493 500 664 664 674

Filter box F25 1) kg + 11 + 13

Filter box F50 1) kg + 22 + 261) Additional weight compared to the design with filter box F00

Table H10: Dimensions and weights, RoofVent® LH

RoofVent® LH

Technical data

190



LH-6

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 0 6 0 0 5 5 0 0 0 5 0 0 5 4 0 0 0 4

Supply air



Diagram H1: Air flow rate for RoofVent® LH-6 with additional pressure drops

RoofVent® LH

Technical data

191

E

E

F

G

H

J

J

K

L

M

N


LH-9

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 5 8 0 0 0 8 0 0 5 7 0 0 0 7 0 0 5 6

Supply air


Diagram H2: Air flow rate for RoofVent® LH-9 with additional pressure drops

RoofVent® LH

Technical data

192

4 Design example

Design data ■ Minimum fresh air flow rate or minimum air change rate ■ Minimum fresh air rate ■ Hall geometry (length, width, height) ■ Design fresh air temperature ■ Desired room temperature (in the occupied area) ■ Extract air temperature 1)

■ Fabric heat losses (portion to be covered by the RoofVent® units)

■ Internal heat gains (machines, lighting, etc.) ■ Heating medium

Note If more than 40 % of fresh air is constantly required, a unit with energy recovery is more economical.

1) As a rule, the extract air temperature is higher than the temperature in the occupied area. This is the result of unavoidable temperature stratification in high spaces, but is reduced to a minimum with the Air-Injector. A tempe-rature gradient of only 0.2 K per metre hall height can therefore be assumed.

ExampleMinimum fresh air flow rate .........................6'000 m³/hMinimum fresh air rate ......................................... 20 %Hall geometry (L x W x H) .................... 52 x 45 x 11 mDesign fresh air temp. ....................................... -15 °CDesired room temperature...................................20 °CExtract air temperature ........................................22 °CFabric heat losses ............................................. 78 kWInternal heat gains ............................................. 12 kWHeating medium ................................. LPHW 60/40 °C


Required number of units nreqBased on the air flow rate per unit (see Table H4), select a trial unit size. (Depending on the results of further calcu-lations, repeat the layout design for another unit size if necessary.)

nreq = Vreq / (VU · R)

Vreq = required fresh air quantity in m³/hVU = air flow rate for the selected unit size in m³/hR = Minimum fresh air rate in %

Approximate selection: Unit size LH-9

nreq = 6'000 / (8'000 · 0.2)nreq = 3.75

Select 4 LH-9s.


V = n · VU · R


V = 4 · 8'000 · 0.2V = 6'400 m³/h

Recirculation air flow rate VR (in m³/h)

VR = n · VU · (1 – R)

V = 4 · 8'000 · (1 – 0.2)V = 25'600 m³/h

Total ventilation heat requirement QV (in kW)

QV = V · ρ· c · (troom – tfresh)

ρ = Specific air density 1.2 kg/m³c = Specific heat capacity of the air 2.79 · 10-4 kWh/kg Ktroom = Desired room temperature in °Ctfresh = Design fresh air temperature in °C

QV = 6'400 · 1.2 · 2.79 · 10-4 · (20 – (-15))QV = 75 kW

RoofVent® LH

Design example

193

E

E

F

G

H

J

J

K

L

M

N

Total recirculation heat QR (in kW)

QR = VR · ρ · c · (text – troom)

text = extract air temperature in °C

QR = 25'600 · 1.2 · 2.79 · 10-4 · (22 – 20)QR = 17 kW

Required heat output total QH (in kW)

QH = QL + QV – QR – QM

QL = fabric heat losses in kWQM = internal heat gains in kW

Use the following criteria for calculation of internal heat gains (connected loads of machines and lighting): Operating times, diversity, direct heat output through convection, indi-rect heat output through radiation, etc.

QR = 78 + 75 – 17 – 12QH = 124 kW

Required heat output per unit Q (in kW)

Q = QH / n

Q = 124 / 4Q = 31 kW

Selection of coil type ■ First, use Table H6 to define the air inlet temperature at

the heating coil. ■ Using the required heat output per unit and the air inlet

temperature at the heating coil, select the required coil type from Table H7 or Table H8.

At tfresh = -15 °C and text = 22 °C, the air inlet temperature at the heating coil is 15 °C.Select coil type B with 34 kW heat output at LPHW 60/40 °C and tAI = 15 °C.

Checking the ancillary conditions ■ Maximum mounting height

Select a different coil type or unit size if the actual moun-ting height (= distance between the floor and the bottom edge of the unit) is greater than maximum mounting height Hmax (seeTable H7, Table H7).

■ Maximum floor area reached Calculate the floor area reached per unit using the selected number of units. If it exceeds the maximum value listed in TableTable H4, increase the number of units.

■ Compliance with minimum and maximum distances Check the resulting distances based on the hall geometry and arrangement of the units, using the information in Table H9 .

Actual mounting height = 9.2 m Max. mounting height Hmax = 17.4 m → OK




Select 4 LH-9s with heating coil type B. They ensure cost-effective and energy-saving operation.

RoofVent® LH

Design example

194

5 Options

RoofVent® LH units can be adapted to the requirements of the specific project with a series of options. You will find a detailed description of all optional components in Part J 'Options' of this handbook.

Option Use



High-pressure fan supply air To overcome additional external pressure drop (e.g. from supply air ducts installed on-site)

High-pressure fan exhaust air To overcome additional external pressure drop (e.g. from extract air ducts installed on-site)









Actuator with spring return As additional frost protection (closes the fresh air damper and the exhaust air damper during a power failure)



Table H11: Availability of options for RoofVent® LH

RoofVent® LH

Options

195

E

E

F

G

H

J

J

K

L

M

N

6 Control systems

There are basically two possibilities for controlling the RoofVent® LH:

System Description

Hoval DigiNet We strongly advise that the RoofVent® LH is controlled by Hoval DigiNet. This control system, developed specifically for Hoval indoor climate systems, offers the following advantages:




■ DigiNet constantly optimises the fresh air rate. ■ The ready-to-connect units with integrated control compo-

nents are easy to plan and install. ■ Commissioning of the DigiNet is quick and easy thanks

to the plug & play components and pre-addressed control modules.


Non-Hoval system RoofVent® LHs can also be controlled with non-Hoval systems. However, the non-Hoval system must take the special features of the decentralised systems into account.In the design for non-Hoval control, the RoofVent® LH comes only with a basic terminal box instead of the DigiUnit terminal box. Additional information can be found in the separate description 'Terminal box unit RoofVent® LH' (available on request).

Table H12: Control systems, RoofVent® LH

RoofVent® LH

Control systems

196


7.1 Assembly


RoofVent® LH units are delivered in 2 sections (roof unit, below-roof unit) on a wooden pallet. Parts which belong together are labelled with the same unit number.










Fig. H5: RoofVent® roof units are installed from roof level.








The Hoval DigiNet control system switches on 'Enable heating' for 1 minute once a week. This prevents the main pump from blocking after a prolonged shutdown.





Caution Risk of injury from falling parts. Do not apply any loads to the coil, e.g. by means of the flow or return!

Note Use the 'Hydraulic assembly' or 'Magnetic mixing valve' options for quick and easy hydraulic installa-tion.

RoofVent® LH


197

E

E

F

G

H

J

J

K

L

M

N


novaNet system bus

Power supply

Connection box



Fresh air sensor

Room air sensor


Main pump

DigiMaster

Zone control panel

Enable heating


Fig. H6: Conceptual drawing for hydraulic diverting system

< 2

m

RoofVent® LH


198





wiring diagram (for wiring within the unit, see Fig. H7). ■ Install the system bus for the control systems separately








Power supply

Bus cable

Connection box

Fig. H7: Wiring in unit

RoofVent® LH


199

E

E

F

G

H

J

J

K

L

M

N

Component Description Voltage Cable Option Comment


Power supply 3 x 400 V LH-6: 5 x 4 mm²LH-9: 5 x 6 mm²


Heating pump 3 x 400 V 4 x 2.5 mm² For injection system










3 x 1.5 mm² Max. 6 A


Power supply for RoofVent® LH

3 x 400 V LH-6: 5 x 4 mm²LH-9: 5 x 6 mm²

Per RoofVent® LH




Variant:










3 x 1.5 mm² Max. 6 A





Table H13: Cable list

RoofVent® LH


200


RoofVent® LH supply and extract air handling unit, consisting of:

■ Roof unit ■ Filter box ■ Heating section ■ Air-Injector ■ Control systems


8.1 Roof unit L



■ Opposed fresh air, recirculation and exhaust air dampers with actuator









Type L-… /DN5


… m³/h

Minimum fresh air rate … %



Frequency 50 Hz





Type F-…

8.3 Heating section H.A / H.B / H.C

Aluzinc sheet steel casing, includes the LPHW heating coil made of copper tubes and aluminium fins and the frost controller.

Type H.__-…

Heat output … kW



8.4 Air-Injector D

Casing made from Aluzinc sheet steel with: ■ Vortex air distributor with concentric outlet nozzle, adjus-


mixing valve heating)

Type D -9


RoofVent® LH

Specification texts

201

E

E

F

G

H

J

J

K

L

M

N

8.5 Options




frequency converter



Hydraulic assembly diverting system HGPrefabricated assembly for hydraulic diverting system, consisting of magnetic mixing valve, balancing valve, ball valve, automatic air vent and screw connections for connec-tion to the unit and to the distributor circuit; ready-to-connect mixing valve for connection to the connection box; sized for the respective heating coil and the Hoval DigiNet control system

Magnetic mixing valve ..HVContinuous regulating valve with magnetic drive, ready for connection to the connection box, sized for the respective heating coil


Exhaust air silencer FSDAs an attachment to the exhaust air grille, casing consisting of Aluzinc sheet steel with built in sound attenuation splitters, for reducing the noise from the exhaust air grille, insertion attenuation _____ dB




Actuator with spring return SMFContinuous actuators with safety function in case of a power failure, mounted and wired on the fresh air damper

Air outlet box AKConsisting of Aluzinc sheet steel, with four adjustable exhaust air grilles (replaces the Air-Injector)

Design for injection system ESControl and high-voltage section for the heating pump integ-rated into the DigiUnit terminal box

RoofVent® LH

Specification texts

202

8.6 Control systems


















■ 1 fresh air sensor ■ 1 transformer 230/24 V ■ 2 circuit breakers for transformer (1-pin) ■ 1 relay ■ 1 safety relay (2-pin, external) ■ Input and output terminals (top) ■ 1 wiring diagram of the system ■ 1 DigiZone controller, 1 relay and 1 room air sensor

(included) for each control zone


■ Processes the following inputs: room and fresh air tempe-rature, heating trouble and special functions (optional)

■ Controls the operating modes according to the scheduler ■ Sets the outputs for enable heating and the collective

trouble indicator




RoofVent® LH

Specification texts

RoofVent® LKSupply and extract air handling unit with optimum fresh air rate for heating and cooling high spaces

I

1 Use _____________________________204

2 Construction and operation___________204

3 Technical data _____________________ 211

4 Design example ____________________222

5 Options __________________________224

6 Control systems____________________225

7 Transport and installation ____________226

8 Specification texts __________________230

RoofVent® LK

Content

204

1 Use

1.1 Intended use

RoofVent® LK units are used to supply fresh air, for the disposal of extract air as well as for heating and cooling of high spaces coupled with an optimised fresh air rate. Also included under intended use are compliance with the instal-lation, commissioning, operating and maintenance provisions (operating manual).Any use beyond this is considered improper use. The manufacturer shall not be held responsible for any damage resulting from such use.

1.2 User group

RoofVent® LK units may only be installed, operated and maintained by authorized and trained specialists who are familiar with the equipment and aware of the dangers involved.The operating manual is for English-speaking operating engineers and technicians as well as specialists in building, heating and ventilation technology.

1.3 Risks

RoofVent® LK units are built to correspond to the state of the art and to current safety standards. However, despite all precautionary measures taken, there are still some potential hazards which are not immediately obvious, such as:

■ Dangers when working with the electrical systems ■ When working on the ventilation unit, parts (e.g. tools) can





The RoofVent® LK provides fresh air supply and extract air removal as well as heating and cooling for large spaces (production halls, shopping centres, sports halls, exhibition halls etc.). It fulfils the following functions:

■ Heating (with connection to the central boiler system) ■ Cooling (with connection to chilled water system) ■ Fresh air supply ■ Extract air removal ■ Recirculation ■ Mixed air operation ■ Air distribution via Air-Injector ■ Air filtration

A ventilation system consists of several autonomous RoofVent® LK units and, as a rule, works without supply and extract air ducts. The units are decentrally installed in the roof and are also serviced from roof level.Thanks to their high output and efficient air distribution, RoofVent® LK units have a large operating range. This means that compared with other systems, only few units are necessary to create the required conditions.The units make use of the extract air energy in mixed air operation. The DigiNet control system constantly optimises the fresh air rate: Only as much fresh air is taken in as is necessary to maintain the room temperature without additi-onal heating or cooling. A minimum value can be set.


The RoofVent® LK consists of the following components: ■ Roof unit:


■ Filter box: available in three standard lengths per unit size for adjustment to specific dimensional requirements

■ Heating/cooling section: coil connections possible on each side (usually under-neath the extract air grille)


The unit is delivered in two sections: above-roof unit and below-roof unit (see Fig. I1). The components are bolted together and can be dismantled individually.

RoofVent® LK

Use

205

B

C

E

E

F

G

H

I

K

K

L

M

N


The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air. The air is therefore blown into the room vertically downward, conically or horizontally. This ensures that:

■ each RoofVent® LK ventilates, heats and cools a large floor area,


saving energy.

Above-roof unit: Roof unit

Below-roof unit:a Filter boxb Heating/cooling sectionc Air-Injector

Fig. I1: Components of the RoofVent® LK

a

b

c

RoofVent® LK


206

RoofVent® LK


207

B

C

E

E

F

G

H

I

K

K

L

M

N




Access panel: access to the heating/cooling coil



Gravity damper: opens in recirculation operation due to underpressure on the supply air side



Fresh air damper: with actuator

Recirculation damper: opposed to the fresh air and exhaust air damper

Exhaust air damper





Extract air grille

Heating/cooling coil: LPHW/LPCW coil consisting of copper tubes with aluminium fins


Fig. I2: Components of the RoofVent® LK

RoofVent® LK


208




Supply air fan


Heating/cooling coil LPHW/LPCW

Frost controller


Supply air sensor



Extract air sensor


Gravity damper

Exhaust air fan


Exhaust air damper (linked with the fresh air damper)


Fig. I3: Operational diagram, RoofVent® LK

RoofVent® LK


209

B

C

E

E

F

G

H

I

K

K

L

M

N

2.3 Operating modes

The RoofVent® LK has the following operating modes: ■ Off ■ Ventilation ■ Ventilation (reduced) ■ Recirculation ■ Recirculation night








Supply air fan ................... OffExhaust air fan ................. OffFresh air damper .............. ClosedRecirculation damper ....... OpenHeating/cooling ................ Off

VE2 VentilationThe RoofVent® unit blows fresh air into the room and draws off spent room air. Heating/cooling and energy recovery are controlled on the basis of heating demand and temperature conditions.The room temperature set value day is active.

During room use Supply air fan ................... OnExhaust air fan ................. OnFresh air damper .............. 0 - 100 % *)

Recirculation damper ....... 0 - 100 % *)

Heating/cooling ................ 0 - 100 % *)

*) depending on heat or cool demand and the set minimum fresh

air rate



REC RecirculationOn/Off operation: When heating or cooling is required, the RoofVent® unit draws in room air, heats or cools it and blows it back into the room.The room temperature set value day is active.

For pre-heating and pre-cooling

Supply air fan ................... On *)

Exhaust air fan ................. OffFresh air damper .............. ClosedRecirculation damper ....... OpenHeating/cooling ................ On *)

*) during heat or cool demand

RECN Recirculation nightLike REC, but with room temperature set value night


RoofVent® LK


210



For special cases Supply air fan ................... OffExhaust air fan ................. OnFresh air damper .............. OpenRecirculation damper ....... ClosedHeating/cooling ................ Off

SA Supply airThe RoofVent® unit blows fresh air into the room. Heating/cooling is controlled on the basis of the heating/cooling demand and temperature conditions.Spent room air passes through open windows and doors or another system provides extraction.The room temperature set value day is active.

For special cases Supply air fan ................... OnExhaust air fan ................. OffFresh air damper .............. OpenRecirculation damper ....... ClosedHeating/cooling ................ 0 - 100 %



Supply air fan ................... On *)


Fresh air damper .............. Open *)


Heating/cooling ................ Off




Supply air fan ................... OnExhaust air fan ................. OffFresh air damper .............. ClosedRecirculation damper ....... OpenHeating/cooling ................ On


Table I1: Operating modes, RoofVent® LK

RoofVent® LK


211

B

C

E

E

F

G

H

I

K

K

L

M

N

3 Technical data


Below-roof unit

LK - 9 / DN5 / L + F00 - K.C - D / ...

Unit typeRoofVent® LK

Unit size6 or 9

ControlDN5 Design for DigiNet 5KK Design for non-Hoval controls

Roof unitRoof unit


Heating/cooling sectionK.C Heating/cooling section with coil type CK.D Heating/cooling section with coil type D

Air-Injector

Options

Table I2: Unit type reference


Unit type LK-6 LK-9

Extract air temperature max. °C 50 50

Extract air relative humidity max. % 60 60

Moisture content of extract air 1) max. g/kg 17 17

Fresh air temperature 2) min. °C -30 -30

Heating medium temperature max. °C 120 120

Operating pressure max. kPa 800 800

Supply air temperature max. °C 60 60

Minimum operating time VE2 min. min 30 30

Amount of condensate max. kg/h 60 150

Air flow rate min. m³/h 3100 5000

Table I3: Application limits of the RoofVent® LK

RoofVent® LK

Technical data

212


Unit type LK-6 LK-9

Air distribution Nominal air flow rate 1) Supply air m³/h 5000 7650

Exhaust air m³/h 5000 7650

Floor area reached Max. m² 484 729

Fan characteristics Supply voltage V AC 3 x 400 3 x 400


Frequency Hz 50 50





Actuators Supply voltage V AC 24 24

Frequency Hz 50 50

Control voltage V DC 2…10 2…10

Torque Nm 10 10

Run time for 90° rotation s 150 150

Filter monitoring Factory setting of differential pressure switches Pa 300 3001) Refers to: RoofVent® LK with heating/cooling coil type C and vertical supply air discharge direction

Table I4: Technical data, RoofVent® LK

RoofVent® LK

Technical data

213

B

C

E

E

F

G

H

I

K

K

L

M

N

3.4 Sound levels

Unit type LK-6 LK-9Operating mode VE2 REC VE2 RECPosition

Sound pressure level (at a distance of 5 m) 1) dB (A) 63 54 48 64 57 49

Total sound power level dB (A) 85 76 70 86 79 71

Octave sound power level 63 Hz dB (A) 56 45 53 57 48 54

125 Hz dB (A) 64 53 60 65 56 61

250 Hz dB (A) 74 67 64 75 70 65

500 Hz dB (A) 79 72 62 80 75 63

1000 Hz dB (A) 79 71 65 80 74 66

2000 Hz dB (A) 78 67 61 79 70 62

4000 Hz dB (A) 73 63 52 74 66 53

8000 Hz dB (A) 68 56 49 69 59 50

1) with hemispherical radiation in a low-reflection environment

Table I5: Sound levels, RoofVent® LK

RoofVent® LK

Technical data

214

3.5 Heat output

Temperature of the fresh air°C 0 -5 -10 -15 -20

of the extract air 18 14 13 12 11 10

20 16 15 14 13 12

22 18 17 16 15 14

24 19 18 17 16 15

26 21 20 19 18 17

Air inlet temperature at the heating coil (with 20 % fresh air)

Table I6: Temperature change through intermixing of recirculation air (all values in °C)

tAI 10 °C 15 °C 20 °CLPHW Size Type Q Hmax tS ΔpW mW Q Hmax tS ΔpW mW Q Hmax tS ΔpW mW


90/70 LK-6 C 86 8.4 59 9 3800 79 8.3 60 8 3500 72 8.3 60 7 3200

80/60 LK-6 C 73 9.1 52 7 3200 66 8.9 54 6 2900 59 8.8 55 5 2600

70/50 LK-6 C 59 10.2 44 5 2600 53 9.9 46 4 2300 46 9.7 47 3 2000

60/40 LK-6 C 45 12.0 36 3 2000 37 11.7 37 2 1600 29 11.7 37 2 1300

82/71 LK-6 C 82 8.6 57 24 6600 75 8.4 59 20 6000 68 8.3 60 17 5500

90/70 LK-9 C 131 9.0 59 8 5800 121 8.9 60 7 5300 110 8.9 60 6 4900

LK-9 D – – – – – – – – – – – – – – –

80/60 LK-9 C 111 9.7 52 6 4900 101 9.5 54 5 4400 91 9.4 55 4 4000

LK-9 D – – – – – – – – – – – – – – –

70/50 LK-9 C 91 10.9 44 4 4000 81 10.6 46 4 3500 71 10.3 48 3 3100

LK-9 D 124 9.2 57 9 5400 111 9.2 57 7 4800 98 9.1 58 6 4300

60/40 LK-9 C 69 12.8 36 3 3000 57 12.5 37 2 2500 44 12.5 37 1 1900

LK-9 D 99 10.4 47 6 4300 85 10.4 47 4 3700 69 10.4 47 3 3000

82/71 LK-9 C 125 9.2 57 21 10100 115 9.0 59 18 9200 105 8.9 60 15 8400

LK-9 D – – – – – – – – – – – – – – –

Legend: tAI = Air inlet temperature at the heating coilType = Type of heating/cooling coilQ = Heat outputHmax = Maximum mounting height (at room temperature 18 °C)tS = Supply air temperature∆pW = Water pressure dropmW = Water flow rate

— These operating conditions are not permissible, because the maximum supply air temperature of 60 °C is exceeded.

Table I7: Heat output, RoofVent® LK

RoofVent® LK

Technical data

215

B

C

E

E

F

G

H

I

K

K

L

M

N

3.6 Cooling capacities

Temperature and rel. humidity of the fresh air°C 30 32 34% 20 40 60 20 40 60 20 40 60

Temperature of the extract air

24 °C 27 27 27 27 27 27 28 28 28 °C

20 50 70 30 50 80 30 60 80 %

26 °C 28 28 28 29 29 29 29 29 29 °C

20 40 70 20 50 70 30 50 80 %

28 °C 30 30 30 30 30 30 31 31 31 °C

20 40 60 20 40 70 20 50 70 %

Air inlet conditions at the cooling coil (with 20 % fresh air)

Table I8: Temperature change through intermixing of recirculation air (all values in °C)

Unit size 6

Temp. 6/12 °C 8/14 °C 10/16 °CtAI rh Type Qsen Qtot tS ∆pW mW mC Qsen Qtot tS ∆pW mW mC Qsen Qtot tS ∆pW mW mC

°C % kW kW °C kPa l/h kg/h kW kW °C kPa l/h kg/h kW kW °C kPa l/h kg/h

27 20 C 17 17 17 6 2400 1 14 14 18 4 2100 1 12 12 20 3 1700 1

40 C 17 17 17 6 2400 1 14 14 18 4 2100 1 12 12 20 3 1700 1

50 C 17 23 17 10 3300 9 14 15 19 5 2200 1 12 12 20 3 1700 1

60 C 18 33 16 19 4700 22 15 25 18 12 3600 15 12 16 20 5 2300 5

29 20 C 20 20 17 8 2800 1 17 17 19 6 2500 1 15 15 20 5 2100 1

40 C 19 22 17 9 3100 3 17 17 19 6 2500 1 15 15 20 5 2100 1

50 C 20 33 17 19 4700 18 17 25 18 12 3600 10 14 15 20 5 2200 1

60 C 20 42 17 29 6000 31 18 36 18 22 5100 25 15 28 20 14 4000 17

31 20 C 22 22 17 10 3200 1 20 20 19 8 2800 1 17 17 20 6 2500 1

40 C 22 30 17 17 4400 11 19 22 19 10 3200 4 17 17 20 6 2500 1

50 C 23 41 17 29 5900 27 20 35 18 21 5000 21 18 27 20 13 3800 12

60 C 22 50 17 40 7200 40 20 44 18 32 6400 35 18 38 20 24 5500 28

Legend: Temp. = Temperature of the cooling mediumtAI = Air inlet temperature at the cooling coilrh = Air inlet humidity at the cooling coilType = Type of cooling coilQsen = Sensible cooling capacity

Qtot = Total cooling capacitytS = Supply air temperature∆pW = Water pressure dropmW = Water flow ratemC = Amount of condensate

Table I9: Cooling capacity, RoofVent® LK-6

RoofVent® LK

Technical data

216

Unit size 9

Temp. 6/12 °C 8/14 °C 10/16 °CtAI rh Type Qsen Qtot tS ∆pW mW mC Qsen Qtot tS ∆pW mW mC Qsen Qtot tS ∆pW mW mC

°C % kW kW °C kPa l/h kg/h kW kW °C kPa l/h kg/h kW kW °C kPa l/h kg/h

28 20 C 25 25 17 5 3600 1 21 21 19 4 3100 1 18 18 20 3 2600 1

D 38 38 12 11 5400 1 33 33 14 9 4700 1 28 28 16 6 4000 1

40 C 25 25 17 5 3600 1 21 21 19 4 3100 1 18 18 20 3 2600 1

D 36 39 13 12 5600 4 33 33 14 9 4700 1 28 28 16 6 4000 1

50 C 25 34 17 9 4900 12 21 21 19 4 3000 1 18 18 20 3 2600 1

D 38 59 12 24 8400 30 32 43 14 14 6200 16 28 28 16 6 4000 1

60 C 27 50 16 17 7200 32 23 37 18 10 5400 21 18 22 20 4 3200 6

D 39 75 11 37 10700 52 34 62 13 27 9000 41 28 46 16 16 6600 25

30 20 C 29 29 17 7 4200 1 26 26 19 5 3700 1 22 22 20 4 3100 1

D 43 43 12 14 6200 1 38 38 14 11 5500 1 33 33 16 9 4800 1

40 C 29 32 18 7 4500 4 26 26 19 5 3700 1 22 22 20 4 3100 1

D 42 56 12 22 8000 19 36 40 15 12 5700 4 33 33 16 9 4800 1

50 C 30 49 17 16 7100 27 26 37 19 10 5300 15 21 22 21 4 3100 1

D 44 74 12 36 10600 44 39 62 14 26 8800 34 33 45 16 15 6500 18

60 C 31 64 17 26 9200 48 28 54 18 19 7800 38 23 41 20 12 5900 25

D 43 89 12 50 12800 67 39 78 13 39 11200 56 35 67 15 29 9500 46

32 20 C 34 34 18 8 4800 1 30 30 19 7 4300 1 26 26 21 5 3700 1

D 48 48 12 17 6900 1 43 43 14 14 6200 1 39 39 16 11 5500 1

40 C 34 46 17 14 6600 17 29 33 19 8 4700 5 26 26 21 5 3700 1

D 48 71 12 33 10100 33 43 58 14 23 8300 21 36 40 16 12 5800 6

50 C 35 63 17 25 9100 41 31 53 18 18 7600 31 27 40 20 11 5700 18

D 48 88 12 49 12500 58 43 77 14 38 11000 48 39 65 15 28 9300 36

60 C 34 77 17 35 11000 61 31 68 18 28 9700 52 28 58 20 21 8400 43

D 48 105 12 67 15000 84 43 94 14 54 13400 74 39 82 15 42 11800 62

Legend: Temp. = Temperature of the cooling mediumtAI = Air inlet temperature at the cooling coilrh = Air inlet humidity at the cooling coilType = Type of cooling coilQsen = Sensible cooling capacity

Qtot = Total cooling capacitytS = Supply air temperature∆pW = Water pressure dropmW = Water flow ratemC = Amount of condensate

Table I10: Cooling capacity, RoofVent® LK-9

RoofVent® LK

Technical data

217

B

C

E

E

F

G

H

I

K

K

L

M

N


X/2 X

Y

Unit type LK-6 LK-9 Align the RoofVent® units so that no unit draws in the exhaust air from another unit as fresh air.


Provide a clear space of approx. 1.5 m on the side opposite to the heating/cooling coil connections for service and maintenance.


Unit clearance X Min. m 11 13

Max. m 21 27

Mounting height Y 1) Min. 1) m 4.0 5.0



values, see Table I7).

Table I11: Minimum and maximum distances

RoofVent® LK

Technical data

218


Roof unit L


Heating/cooling section K

Air-Injector D

Access panel

Cable feedthroughs

Return

Flow


Fig. I4: Dimensional drawing for the RoofVent® LK (dimensions in mm)

80

RoofVent® LK

Technical data

219

B

C

E

E

F

G

H

I

K

K

L

M

N

Unit type LK-6 LK-9


A mm 2100 2400

B mm 1080 1380

C mm 1390 1500

D mm 600 675

E mm 1092 1392


Filter box design F00 F25 F50 F00 F25 F50

G mm 940 1190 1440 980 1230 1480

S mm 2050 2300 2550 2160 2410 2660

H mm 530 780 1030 530 780 1030

F mm 1000 1240

J mm 410 450

K mm 848 1048

M mm 620 610

O mm 767 937

P mm 758 882

Q mm 490 570

R mm 900 1100

V mm 500 630

W mm 54 53

Coil type C C D

N mm 123 92 83

Y mm 78 78 95

Heating coil data Water content l 6.2 9.4 14.2




Weights Roof unit kg 363 482 482

Below-roof unit (with F00) kg 170 240 259

Filter box F00 kg 63 82 82

Heating/cooling section kg 70 102 121

Air-Injector kg 37 56 56

Total (with F00) kg 533 722 741

Filter box F25 1) kg + 11 + 13 + 13

Filter box F50 1) kg + 22 + 26 + 261) Additional weight compared to the design with filter box F00

Table I12: Dimensions and weights, RoofVent® LK

RoofVent® LK

Technical data

220



LK-6

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 0 6 0 0 5 5 0 0 0 5 0 0 5 4 0 0 0 4

Supply air



Diagram I1: Air flow rate, RoofVent® LK-6 with additional pressure drops

RoofVent® LK

Technical data

221

B

C

E

E

F

G

H

I

K

K

L

M

N


LK-9

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 0 5 8 0 0 0 8 0 0 5 7 0 5 6 7 0 0 0 7 0 0 5 6

Supply air


Diagram I2: Air flow rate, RoofVent® LK-9 with additional pressure drops

RoofVent® LK

Technical data

222

4 Design example

Note The following design example relates to cooling mode. The design rating for heating mode can be performed analogously to the design example above in Part H 'RoofVent® LH.'

Design data ■ Minimum fresh air flow rate or minimum air change rate ■ Minimum fresh air rate ■ Hall geometry (length, width, height) ■ Design conditions ■ Desired room temperature ■ Extract air temperature ■ Cooling load ■ Cooling medium

Note If more than 40 % of fresh air is constantly required, a unit with energy recovery is more economical.

1) As a rule, the extract air temperature is higher than the temperature in the occupied area. This is the result of unavoidable temperature stratification in high spaces, but is reduced to a minimum with the Air-Injector. A tempe-rature gradient of only 0.2 K per metre hall height can therefore be assumed.

ExampleMinimum fresh air flow rate .......................17'500 m³/hMinimum fresh air rate ......................................... 20 %Hall geometry Space (L x W x H) ......... 108 x 40 x 9 mDesign conditions ...................................... 30 °C/40 %Desired room temperature...................................24 °CExtract air temperature ........................................26 °CCooling load..................................................... 260 kWCooling medium.................................... LPCW 6/12 °C


Required number of units nreqBased on the air flow rate per unit (see Table I4), select a trial unit size. (Depending on the results of further calcu-lations, repeat the layout design for another unit size if necessary.)

nreq = Vreq / (VU · R)

Vreq = Required fresh air quantity in m³/hVU = Air flow rate for the selected unit size in m³/hR = Minimum fresh air rate in %

Approximate selection: Unit size LK-9

nreq = 17'500 / (7'650 · 0.2)nreq = 11.44

Select 12 LK-9s.


V = n · VU · R


V = 12 · 7'650 · 0.2V = 18'360 m³/h

Recirculation air flow rate VR (in m³/h)

VR = n · VU · (1 – R)

V = 12 · 7'650 · (1 – 0.2)V = 73'440 m³/h

RoofVent® LK

Design example

223

B

C

E

E

F

G

H

I

K

K

L

M

N

Total ventilation cold requirement QV (in kW)

QV = V · ρ· c · (tfresh – troom)

ρ = Specific air density 1.2 kg/m³c = Specific heat capacity of the air 2.79 · 10-4 kWh/kg Ktfresh = Design fresh air temperature in °Ctroom = Desired room temperature in °C

QV = 18'360 · 1.2 · 2.79 · 10-4 · (30 – 24)QV = 37 kW

Required sensible cooling capacity total QC (in kW)

QC = QCL + QV

QCL = Cooling load in kW

QC = 260 + 37QC = 297 kW

Required sensible cooling capacity per unit Q (in kW)

Q = QC / n

Q = 297 / 12Q = 25 kW

Selection of coil type ■ First, use Table I8 to define the air inlet temperature at

the cooling coil. ■ Using the required cooling capacity per unit and the air

inlet conditions at the cooling coil, select the required coil type from Table I9 or Table I10.

Note Note that the total cooling capacity Qtot must be used for dimensioning of the chiller.

For the fresh air conditions 30 °C / 40% and the extract air temperature 26 °C, the air inlet conditions at the cooling coil are 28 °C / 40 %.Select coil type C with 25 kW sensible cooling capacity at LPCW 6/12 °C and air inlet conditions 28 °C / 40 %.

Checking the ancillary conditions ■ Maximum floor area reached Calculate the floor area reached per unit using the selected number of units. If it exceeds the maximum value listed in Table I4, increase the number of units.

■ Compliance with minimum and maximum distances Check the resulting distances based on the hall geometry and arrangement of the units, using the information in Table I11.

Floor area per unit = 108 · 40 / 12 = 360 m²Max. floor area reached = 729 m² → OK



12 LK-9s with cooling coil type C are selected. They guarantee cost-effective and energy-saving operation.

RoofVent® LK

Design example

224

5 Options

RoofVent® LK units can be adapted to the requirements of the specific project with a series of options. You will find a detailed description of all optional components in Part J 'Options' of this handbook.

Option Use



High-pressure fan supply air To overcome additional external pressure drop (e.g. from supply air ducts installed on-site)

High-pressure fan exhaust air To overcome additional external pressure drop (e.g. from extract air ducts installed on-site)











Condensate pump To drain condensate from the condensate separator through waste water pipes directly below the ceiling or onto the roof


Additional heating section for 2 completely separate hydraulic circuits


Table I13: Availability of options for the RoofVent® LK

RoofVent® LK

Options

225

B

C

E

E

F

G

H

I

K

K

L

M

N

6 Control systems

There are basically two possibilities for controlling the RoofVent® LK:

System Description

Hoval DigiNet We strongly advise that the RoofVent® LK is controlled by Hoval DigiNet. This control system, developed specifically for Hoval indoor climate systems, offers the following advantages:




■ DigiNet constantly optimises the fresh air rate. ■ The ready-to-connect units with integrated control compo-

nents are easy to plan and install. ■ Commissioning of the DigiNet is quick and easy thanks

to the plug & play components and pre-addressed control modules.


Non-Hoval system RoofVent® LKs can also be controlled with non-Hoval systems. However, the non-Hoval system must take the special features of the decentralised systems into account.In the design for non-Hoval control, RoofVent® LK units are supplied only with a basic terminal box instead of the DigiUnit terminal box. Additional information can be found in the sepa-rate description 'Terminal box unit RoofVent® LK' (available on request).

Table I14: Control systems, RoofVent® LK

RoofVent® LK

Control systems

226


7.1 Assembly


RoofVent® LK units are delivered in 2 sections (roof unit, below-roof unit) on a wooden pallet. Parts which belong together are labelled with the same unit number.










Fig. I5: RoofVent® roof units are installed from roof level.








The Hoval DigiNet control system switches on 'Enable heating' for 1 minute once a week. This prevents the main pump from blocking after a prolonged shutdown.





Caution Risk of injury from falling parts. Do not apply any loads to the coil, e.g. by means of the flow or return!

Note Use the 'Condensate pump', 'Hydraulic assembly' or 'Magnetic mixing valve' options for quick and easy hydraulic installation.

Condensate drainDimension the slope and cross-section of the condensate line so that no condensate backflow takes place.

RoofVent® LK


227

B

C

E

E

F

G

H

I

K

K

L

M

N


novaNet system bus

Power supply

Connection box



Fresh air sensor

Room air sensor



Main pump

DigiMaster

Zone control panel

Selector switch heating/cooling

Enable heating

Enable cooling


Heating circuit

Cooling circuit

Fig. I6: Conceptual drawing for hydraulic diverting system

< 2

m

RoofVent® LK


228





wiring diagram (for wiring within the unit, see Fig. I7). ■ Install the system bus for the control systems separately








Power supply

Bus cable

Connection box

Fig. I7: Wiring in unit

RoofVent® LK


229

B

C

E

E

F

G

H

I

K

K

L

M

N

Component Description Voltage Cable Option CommentDigiUnit terminal box

Power supply 3 x 400 V LK-6: 5 x 4 mm²LK-9: 5 x 6 mm²


Heating/cooling pump 3 x 400 V 4 x 2.5 mm² For injection system, per pump








Enable cooling Volt-freeMax. 230 V



Trouble input cooling 24 V 3 x 1.5 mm² Per zone


3 x 1.5 mm² Max. 6 A


Power supply for RoofVent® LK

3 x 400 V LK-6: 5 x 4 mm²LK-9: 5 x 6 mm²

Per RoofVent® LK




Variant:








Enable cooling Volt-freeMax. 230 V



Trouble input cooling 24 V 3 x 1.5 mm² Per zone


3 x 1.5 mm² Max. 6 A





Table I15: Cable list

RoofVent® LK


230


RoofVent® LK supply and extract air handling unit, consisting of:

■ Roof unit ■ Filter box ■ Heating/cooling section ■ Air-Injector ■ Control systems





■ Opposed fresh air, recirculation and exhaust air dampers with actuator









Type L-… /DN5


… m³/h

Minimum fresh air rate … %



Frequency 50 Hz





Type F-…

8.3 Heating/cooling section K.C / K.D

Internally insulated Aluzinc sheet steel casing, containing the heating/cooling coil made of copper tubes and aluminium fins, the condensate separator with collecting channel and the frost controller; siphon for connection to a condensate line (included in delivery)

Type K.__-9

Heat output … kW



Cooling capacity … kW

Cooling medium LPCW … °C


At inlet humidity … %

RoofVent® LK

Specification texts

231

B

C

E

E

F

G

H

I

K

K

L

M

N

8.4 Air-Injector D

Internally-insulated Aluzinc sheet steel casing with: ■ Vortex air distributor with concentric outlet nozzle, adjus-


heating/cooling mixing valve)

Type D -9


8.5 Options




frequency converter



Hydraulic assembly diverting system HGPrefabricated assembly for hydraulic diverting system, consisting of magnetic mixing valve, balancing valve, ball valve, automatic air vent and screw connections for connec-tion to the unit and to the distributor circuit; ready-to-connect mixing valve for connection to the connection box; sized for the respective heating/cooling coil and the Hoval DigiNet control system

Magnetic mixing valve ..HVContinuous regulating valve with magnetic drive, plug-in for connection to the connection box, sized for the respective heating/cooling coil


Exhaust air silencer FSDAs an attachment to the exhaust air grille, casing consisting of Aluzinc sheet steel with built in sound attenuation splitters,

for reducing the noise from the exhaust air grille, insertion attenuation _____ dB




Actuators with spring return SMFModulating actuators with safety function in case of a power failure, mounted and wired on the fresh air damper and ER damper

Air outlet box AKMade of Aluzinc sheet steel, with 4 adjustable exhaust air grilles (replaces the Air-Injector)

Condensate pump KPConsisting of a centrifugal pump, a drip tray, max. delivery rate of 150 l/h with a delivery head of 3 m

Heating and cooling in the 4-pipe systemThere is an additional heating section installed in the below-roof unit:

■ Heating section H.A / H.B / H.CAluzinc sheet steel casing, containing the LPHW heating coil made of copper tubes and aluminium fins and the frost controller.

Type H.__-…

Heat output … kW



Design for injection system ESControl and high-voltage section for the heating/cooling pump integrated into the DigiUnit terminal box

RoofVent® LK

Specification texts

232

8.6 Control systems


















■ 1 fresh air sensor ■ 1 transformer 230/24 V ■ 2 circuit breakers for transformer (1-pin) ■ 1 relay ■ 1 safety relay (2-pin, external) ■ Input and output terminals (top) ■ 1 wiring diagram of the system ■ 1 DigiZone controller, 1 heating/cooling selector switch,

1 relay and 1 room air sensor (supplied) for each control zone


■ Processes the inputs room and fresh air temperature, heating trouble, cooling trouble and special functions (optional)

■ Controls the operating modes according to the scheduler ■ Sets the outputs for enable heating, enable cooling and

the collective trouble indicator




RoofVent® LK

Specification texts

Options J

1 Availability ________________________234

2 ColdClimate design _________________236

3 Hygiene design ____________________236

4 Oil-proof design ____________________237

5 High-pressure fan supply air __________238

6 High-pressure fan exhaust air _________240

7 Fans with variable air flow rate ________242

8 Hydraulic assembly diverting system ___242

9 Magnetic mixing valve _______________245

10 Fresh air silencer __________________246

11 Exhaust air silencer ________________246

12 Supply air silencer _________________ 247

13 Extract air silencer ________________ 247

14 Acoustic cowl _____________________248

15 Actuators with spring return _________248

16 Air outlet box _____________________248

17 Extract air filter in front of the extract air grille ___________________249

18 Drop eliminator ___________________249

19 Condensate pump _________________250

20 Heating and cooling in the 4-pipe system 250

21 Design for injection system __________252

Options

Content

234

1 Availability

1.1 Available options

The following optional components are available for the various types of unit:

Col

dClim

ate

desi

gn

Oil-

proo

f des

ign

Hyg

iene

des

ign

Fans

with

var

iabl

e ai

r flow

rate

Hig

h-pr

essu

re fa

n su

pply

air

Hig

h-pr

essu

re fa

n ex

haus

t air

Hyd

raul

ic a

ssem

bly

dive

rtin

g sy

stem

Mag

netic

mix

ing

valv

e

Fres

h ai

r sile

ncer

Exha

ust a

ir si

lenc

er

Supp

ly a

ir si

lenc

er

Extr

act a

ir si

lenc

er

Aco

ustic

cow

l

Act

uato

rs w

ith s

prin

g re

turn

Air

outle

t box

Extr

act a

ir fil

ter i

n fr

ont o

f the

ext

ract

air

grill

e

Dro

p el

imin

ator

Con

dens

ate

pum

p

Hea

ting

and

cool

ing

in th

e 4-

pipe

sys

tem

Des

ign

for i

njec

tion

syst

em

RoofVent® LHW 1) 1) 1) 1) – – –

RoofVent® LKW 1) 1) 1) 1) –

RoofVent® twin heat – – – – – –

RoofVent® twin cool – – – – –

RoofVent® twin pump – – – – – – – – –

RoofVent® condens – – – – – – – – – –

RoofVent® LH – – – – – –

RoofVent® LK – – – –

Legend: – = Not available

= Available as an option

= Standard equipment

1) only for the unit sizes 6 and 9

Table J1: Availability of options

Options

Availability

235

B

E

E

F

G

H

I

J

L

L

M

N

1.2 Possible combinations

Not all optional components can be freely combined. The table below shows which combinations are not possible:

Col

dClim

ate

desi

gn

Oil-

proo

f des

ign

Fans

with

var

iabl

e ai

r flow

rate

Hyd

raul

ic a

ssem

bly

dive

rtin

g sy

stem

Extr

act a

ir si

lenc

er

Aco

ustic

cow

l

Des

ign

for i

njec

tion

syst

em

Oil-proof design ×

Hygiene design

Fans with variable air flow rate × ×

High-pressure fan supply air × ×

High-pressure fan exhaust air × ×

Hydraulic assembly diverting system ×

Magnetic mixing valve ×

Exhaust air silencer ×

Extract air silencer ×

Actuators with spring return

Air outlet box ×

Extract air filter in front of the extract air grille × ×

Drop eliminator

Condensate pump


Design for injection system ×

Design for non-Hoval control × ×

Legend: × = not combinable

Table J2: Non-combinable options

Options

Availability

236

2 ColdClimate design

RoofVent® units in ColdClimate design are suitable for use in areas where the outside temperatures fall below -30 °C. The following features ensure additional frost protection:

■ Cold-resistant materials ■ Fans with downtime heating ■ Valve actuators with spring return and additional heating ■ Heating coil or heating/cooling coil type X with water-side

frost monitoring

Note The dimensions, weights and performance data of coil type X are the same as for type C.

■ Safety switching in DigiNet: delayed starting response when switching to ventilation

■ Defrost switch for the plate heat exchanger (controlled via a differential pressure switch)

The application limits differ from those of the standard design as follows:

Type cc40 cc60

Fresh air temperature min. °C -40 -60

Extract air relative humidity 1) max. % 40 40

Moisture content of extract air 1) max. g/kg 5 51) in winter

Table J3: Application limits of the ColdClimate design

Please note the following: ■ A Richardson constant hydraulic switch is required for the

water-side frost monitoring. An injection system should therefore always be installed.

■ If control of the return temperature (return flow increase) is provided for the heat generator, this must not have a negative impact on the heating of the RoofVent® units.

3 Hygiene design

RoofVent® units in hygiene design are suitable for use in applications with more stringent hygiene requirements. The unit design corresponds to VDI Guideline 6022. These units differ from the standard design as follows:

■ Fresh air filter class F7 ■ Extract air filter class F5 ■ All open-pored sound proofing and seals are coated. ■ The filter holder is also sealed.

Note All other requirements of VDI Guideline 6022 are also met by RoofVent® units in standard design.

Technical dataThe technical data changes due to the additional filter pres-sure drop:

■ The nominal air flow rates and the maximum mounting heights are reduced by approx. 8 %.

■ The heating and cooling capacities decrease by approx. 5 %.

■ The factory setting of the differential pressure switches is 450 Pa for the fresh air filter and 350 Pa for the extract air filter.

Options

ColdClimate design

237

B

E

E

F

G

H

I

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L

L

M

N

4 Oil-proof design

RoofVent® units in oil-proof design are suitable for use in applications with oil-containing extract air. The following features ensure trouble-free operation of the system:

■ Oil-proof materials ■ Special extract air filter (class F5) ■ Condensate drain from the plate heat exchanger to the drip tray in the filter box


Note Due to the greater pressure drop of the extract air filter, the exhaust air flow rate is approx. 5 % lower.

Despite all precautions, there are still residual risks: ■ Oil-saturated components can ignite in the event of flying sparks (fire hazard).

■ Environmental pollution from the residual oil escaping from the exhaust air.

■ With higher concentrations of oil aerosols, droplets can form on the outside of the below-roof unit and drip into the occupied area.

Condensate drain

Connection for oil/condensate drain

Fig. J1: RoofVent® units in oil-proof design

Please note the following: ■ Install an oil/condensate drain with a siphon trap in

accordance with the local provisions to remove these types of emulsions.

■ Do not damage or drill into the filter box, in order not to breach the sealing.

■ Check the extract air filter at regular intervals.

RoofVent® units in oil-proof design are not available with the short filter box F00, with a long filter box or with filter boxes in special lengths.

Fig. J2: Dimensional drawing for oil/condensate drain (in mm)

52

60 Rp ¾"

Options

Oil-proof design

238

5 High-pressure fan supply air

The high-pressure supply air fan is used to overcome additional pressure drops, e.g. through a supply air duct. It replaces the standard supply air fan. Please note the following:

■ Unit size 6: An additional pressure drop always results in a lower nominal air flow rate. Due to the steeper fan characteristic curve, however, the decrease in air flow rate is smaller than for the standard fan.

■ Unit size 9: At nominal air flow rate, an additional pressure drop of 130 Pa is provided compared with the standard design.

Note An additional pressure drop of at least 130 Pa is required for correct operation of unit size 9.

Technical dataThe technical data differs from the standard design as follows:

■ Fan characteristics (see Table J4) ■ Sound levels (see Table J5, Table J6) ■ Nominal air flow rate (see Diagram J1, Diagram J2) ■ Heat output, max. mounting height: The values applicable

for the respective operating point are available upon request.

Type HZ-6 HZ-9

Supply voltage V AC 3 x 400 3 x 400


Frequency Hz 50 50





Table J4: Fan characteristics for the high-pressure fan supply air

Unit type LHW/LKW-6 LHW/LKW-9 2)

Operating mode VE2 REC VE2 RECPosition

Sound pressure level (at a distance of 5 m) 1) dB(A) 52 63 51 54 60 51

Total sound power level dB(A) 74 85 73 76 82 731) with hemispherical radiation in a low-reflection environment2) outdoors (roof unit)

Table J5: Sound levels, RoofVent LHW/LKW with high-pressure fan supply air

Unit type LH/LK-6 LH/LK-9Operating mode VE2 REC VE2 RECPosition

Sound pressure level (at a distance of 5 m) 1) dB(A) 52 63 51 54 60 51

Total sound power level dB(A) 74 85 73 76 82 731) with hemispherical radiation in a low-reflection environment2) outdoors (roof unit)

Table J6: Sound levels, RoofVent LH/LK with high-pressure fan supply air

Options

High-pressure fan supply air

239

B

E

E

F

G

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L

M

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Pressure increase in Pa Standard LKW/LK

HZ-6

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 6 2

0 8 2

0 0 3

0 0 0 6 0 0 5 5 0 0 0 5 0 0 5 4 0 0 0 4

Standard LHW/LH

High-pressure LKW/LK

High-pressure LHW/LH


Diagram J1: Air flow rate for RoofVent® units with high-pressure fan supply air HZ-6


HZ-9

0

0 4

0 8

0 2 1

0 6 1

0 0 2

0 4 2

0 8 2

0 2 3

0 6 3

0 0 4

0 0 5 8 0 0 0 8 0 0 5 7 0 5 6 7 0 0 0 7 0 0 5 6

Standard LHW/LH



An additional pressure drop of at least 130 Pa is required.


Diagram J2: Air flow rate for RoofVent® units with high-pressure fan supply air HZ-9

Options

High-pressure fan supply air

240

6 High-pressure fan exhaust air

The high-pressure fan exhaust air is used to overcome additional pressure drops, e.g. through an extract air duct. It replaces the standard exhaust air fan. Please note the following:

■ Unit size 6: An additional pressure drop always results in a lower nominal air flow rate. Due to the steeper fan characteristic curve, however, the decrease in air flow rate is smaller than for the standard fan.

■ Unit size 9: At nominal air flow rate, an additional pressure drop of 220 Pa is provided compared to the standard design.

Note An additional pressure drop of at least 220 Pa is required for correct operation of unit size 9.

Technical dataThe technical data differs from the standard design as follows:

■ Fan characteristics (see Table J7) ■ Sound levels (see Table J8, Table J9) ■ Nominal air flow rate (see Diagram J3, Diagram J4) ■ Heat output, max. mounting height: The values applicable

for the respective operating point are available upon request.

Type HF-6 HF-9

Supply voltage V AC 3 x 400 3 x 400


Frequency Hz 50 50





Table J7: Fan characteristics for the high-pressure fan exhaust air

Unit type LHW/LKW-6 LHW/LKW-9 2)

Operating mode VE2 VE2Position

Sound pressure level (at a distance of 5 m) 1) dB(A) 65 52 68 52

Total sound power level dB(A) 87 74 90 741) with hemispherical radiation in a low-reflection environment2) outdoors (roof unit)

Table J8: Sound levels, RoofVent LHW/LKW with high-pressure fan exhaust air

Unit type LH/LK-6 LH/LK-9Operating mode VE2 VE2Position

Sound pressure level (at a distance of 5 m) 1) dB(A) 68 59 67 60

Total sound power level dB(A) 90 81 89 821) with hemispherical radiation in a low-reflection environment2) outdoors (roof unit)

Table J9: Sound levels, RoofVent LH/LK with high-pressure fan exhaust air

Options

High-pressure fan exhaust air

241

B

E

E

F

G

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L

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N


HF-6

0

0 2

0 4

0 6

0 8

0 0 1

0 2 1

0 4 1

0 6 1

0 8 1

0 0 2

0 2 2

0 4 2

0 6 2

0 8 2

0 0 3

0 0 0 6 0 0 5 5 0 0 0 5 0 0 5 4 0 0 0 4

Standard LHW/LH




Diagram J3: Air flow rate for RoofVent® units with high-pressure fan exhaust air HF-6


HF-9

0

0 4

0 8

0 2 1

0 6 1

0 0 2

0 4 2

0 8 2

0 2 3

0 6 3

0 0 4

0 0 5 8 0 0 0 8 0 0 5 7 0 0 0 7 0 0 5 6 0 5 6 7

Standard LHW/LH



An additional pressure drop of at least 220 Pa is required.


Diagram J4: Air flow rate for RoofVent® units with high-pressure fan exhaust air HF-9

Options

High-pressure fan exhaust air

242

7 Fans with variable air flow rate

If fans with variable air flow rate are installed in the RoofVent® units, the air flow rate can be varied continuously from 25…100 %. This allows:

■ Ventilation according to requirements, e. g. depending on the CO2 concentration in the room

■ The balancing of supply and extract air flow rates in applications where an independent extraction system is installed (e.g. direct exhausting by machines)

■ Particularly quiet operation of the unit with low fan speed ■ Speed switching via the operating modes (ventilation VE1

and VE2)

Note Order the 'DigiPlus controller' option for the zone control panel if the air flow rate is to be varied by means of an external signal.

Technical dataAlong with the air flow rate, the heating and cooling capaci-ties, the maximum mounting height and the sound levels of the RoofVent® units also change. The values applicable for the respective air flow rate are available upon request.

8 Hydraulic assembly diverting system

Assemblies for hydraulic diverting which are optimally matched to the units are available for easy installation of RoofVent® units. Please note the following:

■ Thermally insulate the hydraulic assembly on-site. ■ To ensure correct operation, install the hydraulic assembly

horizontally.

Caution Risk of injury from falling parts. Mount the hydraulic assembly so that its weight does not need to be absorbed by the coil.

Default settings for the hydraulic alignmentRead off the default settings from Diagram J5. Curves 1.0 to 4.0 correspond to the revolutions of the valve spindles of the balancing valve; they are shown on the dial:0.0 ___ Valve closed4.0 ___ Valve fully openThe coil and the hydraulic assembly are already included in the specified pressure drop. Thus, only consider the pressure drop of the boiler system up to the screw connections (Pos. 4 in Fig. J3).

Application limits

Max. operating pressure 10 bar

Heating/cooling medium temp. 2…120 °C

Ambient temperature - 5…45 °C

Maximum air humidity 95 % (29 g/m³)

Table J10: Application limits of the hydraulic assembly diverting system

Mixing valves

Supply voltage AC 24 V

Frequency 50 Hz

Control voltage DC 0…10 V

Run time of actuator < 1 s

Table J11: Technical data of the mixing valves

Options

Fans with variable air flow rate

243

B

E

E

F

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N

Pressure drop in kPa

HG�6/AB0

02

04

06

08

001

021

041

061

081

002

022

042

000500540004005300030052000200510001

1.0 1.2 1.4 1.6 1.8 2.02.2

2.42.6

3.0

4.0

HG�6/C0

02

04

06

08

001

021

041

061

081

002

022

042

0007005600060055000500540004005300030052000200510001

1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4

2.6

3.0

4.0

HG�9�10/AB0

02

04

06

08

001

021

041

061

081

002

022

042

000900080007000600050004000300020001

1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

3.0

4.0

HG�9�10/C0

02

04

06

08

001

021

041

061

081

002

022

042

000210001100001000900080007000600050004000300020001

1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 3.0

4.0

Water flow rate in l/h

Pressure drop in kPa

HG�9�10/D0

02

04

06

08

001

021

041

061

081

002

022

042

000210001100001000900080007000600050004000300020001

1.0 1.2 1.4 1.6

1.8

2.0

2.2

2.42.6

3.04.0

Water flow rate in l/h

Diagram J5: Default values for the balancing valves

Options


244

Automatic air vent

Screw joint coil

Balancing valve

Screw joint boiler system

Flow


Ball valve

Return

Fig. J3: Dimensional drawing

Type A B C D E Mixing valve Balancing valve Screw joint for coil type

HG-6/AB 758 78 726 1060 300 20-5HV STAD DN32 1¼ " 6/A, 6/B

HG-6/C 758 78 745 1070 300 25-8HV STAD DN32 1¼ " 6/C

HG-9-10/AB 882 78 770 1195 320 25-8HV STAD DN40 1½ " 9-10/A, 9-10/B, 9/T

HG-9-10/C 882 78 791 1210 320 32-12HV STAD DN40 1½ " 9-10/C

HG-9-10/D 882 95 840 1245 340 40-20HV STAD DN50 2 " 9-10/D

Table J12: Dimensions (in mm) and valves of the hydraulic assembly diverting system

Options


245

B

E

E

F

G

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9 Magnetic mixing valve

Mixing valves which are optimally matched to the units are available for easy installation of RoofVent® units. They have the following specifications:

■ modulating control valve with magnetic drive ■ with integrated position control and response ■ separate manual control for emergency operation

(connection to AC 24 V = valve OPEN) ■ ready for connection to the connection box

Table J13: Dimensional drawing for mixing valve

Type DN kvs DI DA L L1 H E F Weight for coil type

20-5HV 20 5 m³/h Pipe thr. ¾ " G 1¼ " 95 52.5 260 80 100 4.2 kg 6/A, 6/B

25-8HV 25 8 m³/h Pipe thr. 1 " G 1½ " 110 56.5 270 80 100 4.7 kg 6/C, 9-10/A, 9-10/B, 9/T

32-12HV 32 12 m³/h Pipe thr. 1¼ " G 2 " 125 67.5 285 80 100 5.6 kg 9-10/C

40-20HV 40 20 m³/h Pipe thr. 1½ " G 2¼ " 140 80.5 320 80 100 9.3 kg 9-10/D

Table J14: Dimensions and weights of the magnetic mixing valves

Application limits

Max. operating pressure 10 bar

Heating/cooling medium temp. 2…120 °C

Ambient temperature - 5…45 °C

Maximum air humidity 95 % (29 g/m³)

Table J15: Application limits of the hydraulic assembly diverting system

Mixing valves


Frequency 50 Hz

Control voltage DC 0…10 V

Run time of actuator < 1 s

Table J16: Technical data of the mixing valves

Options


246

10 Fresh air silencer

The fresh air silencer reduces the noise from RoofVent® units through the weather louvre door. It consists of an Aluzinc cowl with sound attenuation lining and an opening in down-ward direction. The silencer is connected by hinges to the top edge of the unit. Please note the following:

■ Using a fresh air silencer only makes sense in combi-nation with an exhaust air silencer of type FSD-6/110 or FSD-9-10/110.

■ In RoofVent® LH and LK units, additional sound attenua-tion splitters are installed in the fresh air chamber.

Type ASD-6 ASD-9-10

L mm 500 600

W mm 1080 1380

H mm 790 825

Weight kg 44 70

Pressure drop Pa 4 4

Table J17: Technical data for the fresh air silencer

Frequency ASD-6 ASD-9-10

63 Hz -1 0

125 Hz 1 2

250 Hz 5 5

500 Hz 5 6

1000 Hz 6 6

2000 Hz 5 6

4000 Hz 6 5

8000 Hz 4 5

Sum 5 5

Table J18: Insertion attenuation of the fresh air silencer (values in dB at standard fan speed)

11 Exhaust air silencer

The exhaust air silencer reduces the noise from RoofVent® units through the exhaust air grille. It consists of an Aluzinc casing with sound attenuation splitters. Please note the following:

■ The exhaust air flow rate is slightly reduced by the additi-onal pressure drop.

■ The exhaust air silencer is available in two different lengths.

■ The exhaust air silencer is delivered in dismantled form; please follow the assembly instructions.

Type FSD- 6/60 6/110 9-10/60 9-10/110

L mm 600 1100 600 1100

W mm 1080 1080 1380 1380

H mm 790 790 825 825

Weight kg 120 185 125 205

Pressure drop Pa 15 20 20 25

Table J19: Technical data for the exhaust air silencer

Frequency FSD- 6/60 6/110 9-10/60 9-10/110

63 Hz 4 8 6 9

125 Hz 5 9 8 12

250 Hz 9 14 11 17

500 Hz 15 22 15 22

1000 Hz 20 26 17 24

2000 Hz 19 25 19 25

4000 Hz 19 25 15 23

8000 Hz 14 22 11 17

Sum 11 16 13 18

Table J20: Insertion attenuation of the exhaust air silencer (values in dB at standard fan speed)

Options

Fresh air silencer

247

B

E

E

F

G

H

I

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L

L

M

N

12 Supply air silencer

The supply air silencer reduces the noise from RoofVent® units within the room. It consists of an Aluzinc casing with sound attenuation splitters and is mounted between the filter box and heating or cooling sections. Please note the following:

■ The supply air flow rate is slightly reduced by the additi-onal pressure drop.

■ Use in combination with an extract air silencer is recom-mended.

Type ZSD-6 ZSD-9-10

L mm 700 700

W mm 900 1100

H mm 900 1100

Weight kg 90 115


Table J21: Technical data for the supply air silencer

Frequency ZSD-6 ZSD-9-10

63 Hz 10 2

125 Hz 13 7

250 Hz 21 14

500 Hz 19 15

1000 Hz 22 17

2000 Hz 22 16

4000 Hz 26 13

8000 Hz 26 11

Sum 19 12

Table J22: Insertion attenuation of the supply air silencer (values in dB at standard fan speed)

13 Extract air silencer

The extract air silencer reduces the noise from RoofVent® units within the room. It consists of an Aluzinc casing with sound attenuation splitters and is mounted on-site (please follow the assembly instructions included). Please note the following:

■ The extract air flow rate is slightly reduced by the additi-onal pressure drop.

■ Use in combination with a supply air silencer is recom-mended.

■ The extract air silencer is delivered in dismantled form; please follow the assembly instructions.

Type ABSD-6 ABSD-9-10

L mm 500 500

W mm 806 1006

H mm 368 405

Weight kg 21 26


Table J23: Technical data for the extract air silencer

Frequency ABSD-6 ABSD-9-10

63 Hz -1 -2

125 Hz 3 4

250 Hz 7 5

500 Hz 10 8

1000 Hz 12 8

2000 Hz 11 7

4000 Hz 11 4

8000 Hz 12 7

Sum 8 6

Table J24: Insertion attenuation of the extract air silencer (values in dB at standard fan speed)

Options

Supply air silencer

248

14 Acoustic cowl

The acoustic cowl reduces the noise level in the room; it is installed in the Air-Injector. This does not change the outside dimensions of the Air-Injector.The insertion attenuation amounts to 4 dB with respect to the total sound level of the respective RoofVent® unit.

15 Actuators with spring return

In the event of a power failure, actuators with spring return close the fresh air damper and, if there is one, the ER damper, and thus protect the unit from frost. They are installed in place of the standard actuators.

Type SMF


Frequency 50 Hz

Input signal DC 0…10 V

Torque 20 Nm

Run time of actuator 150 s

Run time of spring return 20 s

Table J25: Technical data for the actuators with spring return

Fig. J4: Actuator with spring return

16 Air outlet box

When using the RoofVent® units in low-roofed halls, the air outlet box can be installed in place of the Air-Injector. This reduces the minimum mounting height by 1 m compared to the standard design.The air outlet box has horizontal exhaust air grilles on all sides. The vanes can be manually adjusted without tools to adapt the air discharge angle to the local conditions.

Note The air outlet box replaces the Air-Injector. The total height of the unit is somewhat smaller; the weight is approximately the same.

R

Q

Type AK-6 AK-9/10

R mm 900 1100

Q mm 350 400

Weight kg 36 53

Table J26: Dimensions and weights of the air outlet box

Options

Acoustic cowl

249

B

E

E

F

G

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L

L

M

N

17 Extract air filter in front of the extract air grille

In applications ■ with heavily contaminated extract air ■ with a high increase in humidity inside the room (> 2 g/kg),

an extract air filter can be fitted on the outside of the unit (in front of the extract air grille) to protect plate heat exchanger 2 against contamination. It replaces the extract air filter in the combi box.The extract air filter in front of the extract air grille consists of an Aluzinc sheet steel casing with inserted minipleat filter (class G4 or F5). It is delivered dismantled.

Fig. J5: Dimensions of the extract air filter in front of the extract air grille (in mm)

18 Drop eliminator

Moisture in the extract air can condense in the plate heat exchanger. In order to ensure that no condensate drips into the unit even in applications with very moist extract air, a drop eliminator can be installed. It drains the condensate onto the roof.The drop eliminator consists of aluminium fins; it is mounted in the extract air flow on the air inlet side of plate heat exchanger 1.

Technical dataThe drop eliminator increases the pressure drop; as a result, the exhaust air flow rate of the unit is approx. 5 % lower.

Fig. J6: Drop eliminator on the air inlet side of the plate heat exchanger

Options

Extract air filter in front of the extract air grille

250

19 Condensate pump

RoofVent® cooling units must be connected to a condensate drainage system. For applications where connection to the waste water system would be too complicated or impossible for constructional reasons, a condensate pump is available. This pump is installed laterally on the unit, directly under the condensate drain connection. It pumps the condensate through a flexible hose to a delivery head of 3 m, thus enab-ling discharge of the condensate

■ through waste water pipes directly below the ceiling, ■ onto the roof.

Type KP

Output (at 3 m delivery head) max. 150 l/h

Tank capacity max. 1.9 l

Dimensions (L x W x H) 288 x 127 x 178 mm

Weight 2.4 kg

Table J27: Technical data of the condensate pump

Fig. J7: Condensate pump

20 Heating and cooling in the 4-pipe system

In a 4-pipe system, there are two completely separate hydraulic circuits for heating and cooling (see Fig. J8). For such applications, an additional heating section is installed in the RoofVent® unit. The below-roof unit then consists of:

■ Filter box ■ Heating section (additional) ■ Cooling section ■ Air-Injector

As a result, the technical data also changes (for dimensions and weight of the heating section, see part B – RoofVent® LHW, performance data of the units is available upon request).

The Hoval DigiNet ■ automatically switches between heating and cooling, ■ controls the mixing valve heating and cooling (and if appli-

cable, the heating pump and cooling pump) separately.

Note Order the 'Cooling in the 4-pipe system' option for the DigiNet zone control panel.

Options

Condensate pump

251

B

E

E

F

G

H

I

J

L

L

M

N

< 2

m


novaNet system bus

Power supply

Connection box

Magnetic mixing valve cooling

Magnetic mixing valve heating


Fresh air sensor

Room air sensor



Main pump heating

Main pump cooling

DigiMaster

Zone control panel

Enable heating

Enable cooling


Heating circuit

Cooling circuit

Fig. J8: Conceptual drawing for hydraulic diverting system with cooling in the 4-pipe system

Options


252

21 Design for injection system

Instead of a diverting system, an injection system can also be installed in the load circuit.

Note The injection system is particularly well suited for applications where only a low heat output is required due to high internal heat gains.

Please note the following: ■ In the design for the injection system, the pumps in the

load circuit are also controlled directly by the DigiUnit terminal box, as well as the mixing valves.

■ Terminals for wiring the mixing valves are located in the connection box.

■ Terminals for wiring the pumps in the load circuit are located in the DigiUnit terminal box.

■ Make sure that valves and pumps which meet the following requirements are provided on-site.

Requirements for mixing valves ■ Use three-way mixing valves with linear characteristics

and high quality. ■ The valve authority must be ≥ 0.3. ■ The maximum run time of the valve actuator is 150 s. ■ The valve actuator must be continuous, i.e. the stroke


operation with a separate manual control (AC 24 V).

Requirements for pumpsVoltage _______ 3 x 400 VOutput _______ up to 1.8 kWCurrent _______ up to 5.0 A

Heating pump

Mixing valve heating

Cooling pump

Mixing valve cooling

Table J28: Electrical connections

Options

Design for injection system

253

B

E

E

F

G

H

I

J

L

L

M

N


novaNet system bus

Power supply

Connection box

Heating pump

Mixing valve


Fresh air sensor

Room air sensor


Main pump

DigiMaster

Zone control panel

Enable heating


Fig. J9: Conceptual drawing for injection system

Options

Design for injection system

Control systems K

1 General information ________________256

2 System setup ______________________256

3 Operating options __________________257

4 Zone control panel _________________259

5 Control components in the units _______261

6 Options __________________________262

7 Alarms and monitoring ______________265

Control systems

Content

256

1 General information

Hoval's DigiNet is a control system that was specially deve-loped for decentralised indoor climate units. The system was developed together with Sauter AG, a company which also supplies the hardware components.

2 System setup

Hoval's DigiNet is divided into three hierarchical levels connected by a novaNet system bus.

2.1 Operator level

This is where the user operates the system. Different opera-tional options are available according to project-specific requirements.

2.2 Zone level

Indoor climate units that operate under the same conditions are summarised into control zones. Criteria for the creation of a zone can be, for example, operating times, room tempe-rature set values and so on. In the zone control panel, there is a DigiZone controller for each control zone. It switches the operating modes of the units according to the scheduler.Different unit types can also be combined in a control zone. A distinction is made between:

■ Main units (= fresh air units or supply air units) ■ Additional units (= recirculation units that are switched on

if there is a heat or cool demand).A DigiEco controller is installed in the zone control panel for additional units.

Control zones max. 10

Main units in each control zone max. 9

Additional units in each control zone max. 9

Table K1: Application limits of the Hoval DigiNet

Note Special solutions are possible for larger projects.

2.3 Unit level

A DigiUnit controller is installed in each main unit (= fresh air unit or supply air unit). This controls the unit individually according to local conditions.

2.4 novaNet system bus

The individual Hoval DigiNet components are connected via a novaNet system bus (analogously to the OSI layer model) Data transfer takes place in an event-oriented manner, this reduces data traffic and ensures short reaction times.

novaNet system bus

Cable type 1 pair of wires, drilled,shieldedcategory 5 or above

Topology in series

Length Max. 1900 mFor longer bus lengths: Include a repeater or divide the system into several networks.

Communication Cross-communication with equal priority (peer-to-peer / multiplier)

Loop resistance max. 300 Ω

Capacity max. 200 nF

Table K2: novaNet system bus specification

Example – bus cable Type _______________________G51Dimension (n x n x mm²) _______1 x 2 x 0.8Loop resistance at 20 °C _______37.5 Ω/kmOperating capacity ____________60 nF/kmApplication __________________Category 5e / class DFeatures ___________________drilled, halogen-free

Control systems

General information

257

B

E

E

F

G

H

I

J

K

M

N

3 Operating options

3.1 DigiMaster operator terminal

The DigiMaster is a touch panel with a colour display, making it simple to operate the system. It gives trained users access to all information and settings that are necessary for normal operation:

■ Display and set operating modes ■ Display temperatures and set room temperature set

values ■ Display and program the scheduler and the calendar ■ Display and handle alarms ■ Display and set control parameters

The DigiMaster is installed in the door of the zone control panel.

Power supply

Supply voltage AC 230 V, 50 Hz

Permitted voltage tolerance + 10 % / - 15 %

Rated power consumption max. 7 W

Communication

1x RJ-11 jack novaNet

1x RJ-45 jack Ethernet 10 Base T (application download)

Ambient conditions

Ambient temperature 0…45°C

Storage and transport tempera-ture

- 25…70°C

Ambient humidity 10…80 % rh without condensation

Protection level IP 20optional: IP 65 on the front

Protection class II

Environment class IEC 60721 3k3

Dimensions

W x H x D 240 x 156 x 46 mm

Active surface (W x H) 140 x 105 mm

Table K3: Technical data for the DigiMaster DM5

Fig. K1: Operation via touch panel with the DigiMaster

Fig. K2: DigiMaster installed in the zone control panel door (here with window for DigiMaster)

Control systems

Operating options

258

3.2 Operation via PC and DigiCom

The system can be operated easily using a PC and DigiCom. The operating software clearly displays the system on the PC. It offers the following functions to competent users:

■ Display and set operating modes ■ Display temperatures and set room temperature set

values ■ Display and program the scheduler and the calendar ■ Display and handle alarms and maintain an alarm log ■ Display and set control parameters ■ Trend function for the graphic display of current data ■ Display tables and graphics of historic data ■ Logbook for logging all system actions ■ Differentiated password protection

The DigiCom package consists of the operating software, the novaNet router and the connection cables.

3.3 DigiEasy operator terminal

The DigiEasy is an additional operator terminal for untrained users. Use it to operate one control zone only. It offers the following functions:

■ Display of the current room temperature set value ■ Increase or decrease the set value by up to 3 °C ■ Acknowledge alarms ■ Switch the operating mode:

The buttons usually have the operating modes 'Auto', 'Exhaust air, 'Recirculation night' and 'Off'; this is freely selectable, however (with the exception of the button 'Auto').

The DigiEasy can be installed anywhere in a double flush socket box or in the door of the zone control panel.

Note Use the DigiEasy only in addition to another operating option.

Hardware

Processor Intel Pentium III 800 MHz

Hard disk 9 GB

DVD drive yes

Interfaces 1 serial, 1 mouse, 1 USB

Software

Operating system Windows XP, Windows Vista

Table K4: Requirements with regard to the PC

Design

Set value display 0…50 °C Resolution 0.5 K

Correction of set value ± 3 K

Connection 4-wire to DigiZone

Cable length max. 100 m

Ambient conditions

Ambient temperature 0…45°C

Ambient humidity 10…85% rh without condensation

Environment class 3K3 (IEC 60721)

Protection level IP 30

Protection class III

Table K5: Technical data for the DigiEasy DE5

Fig. K3: Operation via PC Fig. K4: DigiEasy operator terminal

Control systems

Operating options

259

B

E

E

F

G

H

I

J

K

M

N

3.4 Integration at management level with DigiBac

An automation station with BACnet communication card – known as DigiBac – allows you to integrate the Hoval DigiNet at management level. Communication takes place over BACnet/IP on an Ethernet basis.For detailed information on integration at management level, contact Hoval customer service.

4 Zone control panel

Hoval indoor climate units are grouped into control zones, which are controlled from the zone control panel. The DigiZone controller:

■ controls operating modes, ■ transmits the fresh air and room temperature to the indivi-

dual units, ■ sets the output for enable heating or enable cooling and

the collective trouble indicator.

For each panel

1 fresh air sensor (cable length max. 170 m)

1 transformer 230 / 24 V

2 circuit breakers for transformer (1-pin)

1 relay

1 safety relay (2-pin, external)

Connecting terminals for: ■ Fresh air sensor ■ Mains supply

For each control zone

1 DigiZone controller

1 room air sensor (supplied)

1 relay

Connecting terminals for: ■ Room air sensor ■ Enable heating ■ Trouble input heating ■ Collective trouble indicator ■ novaNet system bus

Table K6: Contents of the zone control panel

Caution Danger of electric shocks. Ensure that overcurrent protection equipment is installed onsite for the mains connection line.

Fig. K5: View of the inside of the zone control panel

Control systems

Zone control panel

260

Design

Control panel Coated sheet steel (RAL No. 7035)

Short circuit resistance ICW 10 kA eff

Connecting terminals Top

Installation Floor or wall installation

Ambient conditions

Use Indoors

Ambient temperature 5…40 °C

Storage and transport temperature

- 25…55 °C

Ambient humidity max. 50 % rh at 40 °C max. 90 % rh at 20 °C

Table K7: Technical data for the zone control panel

Enable heating/cooling

Floating signal that reports the heat-/cool demand to the heat generation and refrigeration units on-site

3 x 1.5 mm²max. AC 230 V, 2 A

Trouble input heating/cooling

Alarm input signal that informs the DigiNet that the heat-/cold supply is not working

3 x 1.5 mm²AC 24 V


Floating signal for the external display of a collective alarm

3 x 1.5 mm²max. AC 230 V, 6 A

Table K8: External connections

Size Type Dimensions in mm (W x H x D)

1 SDZ1 380 x 600 x 210

2 SDZ2 600 x 600 x 210

3 SDZ3 600 x 760 x 210

4 SDZ4 760 x 760 x 210

5 SDZ5 800 x 1000 x 300

6 SDZ6 800 x 1200 x 300

7 SDZ7 800 x 1800 x 400

8 SDZ8 1000 x 1800 x 400

9 SDZ9 1200 x 1800 x 400

Table K9: Available sizes and dimensions for the zone control panel

Control systems

Zone control panel

261

B

E

E

F

G

H

I

J

K

M

N

5 Control components in the units

The following are installed in each main unit (= fresh air unit or supply air unit):

■ An extract air sensor ■ A supply air sensor ■ A DigiUnit terminal box (with DigiUnit controller and high-

voltage section)

The DigiUnit controller controls the individual unit, including the air distribution, according to the specifications of the control zone and regulates the supply air temperature using cascade control.The high-voltage section contains:

■ Mains power terminals ■ Isolation switch (can be operated from the outside) ■ Motor contactor for each fan ■ Fuse for the electronics ■ Transformer for the DigiUnit controller, the mixing valve



Caution If the power supply for the DigiUnit terminal box is interrupted, frost protection and monitoring are not guaranteed. The only indication that a DigiUnit controller has broken is when it is no longer displayed on the operator terminal. You should therefore check regularly that the display is complete.

Design

Control box Coated sheet steel Cover screwed down

Protection level IP65

Power supply

Supply voltage 3 x AC 400 V, 50 Hz

Permitted voltage tolerance ± 10 %

Power consumption See section 'Technical data' for the respective unit type

Backup fuse RoofVent® size 6 T 20 A



Table K10: Technical data for the DigiUnit terminal box

Power supply for RoofVent® unit

3 x AC 400 V50 Hz

Table K11: Mains supply

Control systems

Control components in the units

262

6 Options

6.1 Options for operating DigiNet

Window for DigiMasterThe window for DigiMaster (350 x 400 mm) protects the DigiMaster, which is integrated in the panel door, from unau-thorised use and dirt. It consists of an aluminium anodised frame with a seal and a lock.Type: FDM

IP65 frameworkThe IP65 framework is used to integrate the DigiMaster in the panel door and to make it water and dust-proof. It guarantees a front-side protection level of IP 65.Type: IP65

novaNet socketThe novaNet socket is used for easy connection of a DigiCom to the novaNet system bus. The plastic casing contains two RJ-11 jacks and the terminals for wiring the bus input.Type: NS

novaNet routerThe novaNet router is used to connect an operator PC to the novaNet system bus via a COM interface or modem.Type: NR5

4 special functions with switchSpecial functions override the automatic program of the control zone. A selector switch ( IP 65) is installed in the door of the zone control panel (outside the window, if fitted, for the DigiMaster). It can be used to select one of four special functions as shown in Table K12. Other switch assignments are possible on request.Type: SF4

Position Operating mode

AUTO By automated program

OFF Off

EA Exhaust air

RECN Recirculation night

NCS Night cooling summer

Table K12: Switch assignment for 4 special functions

8 special functions with 2 switchesSpecial functions override the automatic program of the control zone. Two selector switches ( IP 65) are installed in the door of the zone control panel (outside the window, if fitted, for the DigiMaster). It can be used to select one of eight special functions as shown in Table K13.Type: SF8

Switch Position Operating mode

1 AUTO By automated program

OFF Off

EA Exhaust air

RECN Recirculation night

NCS Night cooling summer

2 SF1 Special function according to switch 1

REC Recirculation

VE1 Ventilation (reduced)

VE2 Ventilation

SA Supply air

Table K13: Switch assignment for 8 special functions

Special function on terminalSpecial functions override the automatic program of the control zone. A special function that is wired to terminals enables the operating mode to be overridden externally (e.g. the mandatory override to 'Exhaust Air' or 'Off' if there is a fire alarm).Type: SFK

Special function on terminal

3 x 1.5 mm²AC 24 V

Table K14: Connection of the special function on terminal

DigiEasy installationThe DigiEasy operator terminal is installed in the door of the zone control panel.Type: EBG

Control systems

Options

263

B

E

E

F

G

H

I

J

K

M

N

6.2 Options for the zone control panel

Alarm lampA lamp for displaying alarms of priority A is installed in the door of the zone control panel.Type: SSL

SocketA 1-phase socket with a 2-pin circuit breaker is installed in the zone control panel. This socket serves for connecting maintenance tools. Its circuit is not cut out by the safety relay.Type: SST

Control of the main pumpThe high-voltage section required for controlling the main pump (circuit breaker, contactor, thermal relay and switch) is installed in the zone control panel. Type Pump Output

1PPS 1-phase max. 2 kW

3PPS 3-phase max. 4 kW

Table K15: Technical data for the pump control

2-pin circuit breakersThe circuit breakers for the transformer have two pins.Type: 2PS

Power supply for indoor climate units with integrated DigiUnit controllerThe power supply for Hoval indoor climate units with inte-grated DigiUnit controller is integrated in the zone control panel. The following are installed in the panel:

■ The required circuit breakers and output terminals for each unit

■ The safety relay (external)The size of the safety relay depends on the rated current. It replaces the zone control safety relay.

Type Power supply

SIA3 with 3-pin circuit breakers

SIA4 with 4-pin circuit breakers

Table K16: Power supply

Rated current 1) Type 3-pin Type 4-pin

0 – 25 A NT-3/40 NT-4/40

26 – 35 A NT-3/60 NT-4/60

36 – 50 A NT-3/80 NT-4/80

51 – 65 A NT-3/100 NT-4/100

66 – 75 A NT-3/125 NT-4/125

76 – 100 A NT-3/160 NT-4/160

101 – 155 A NT-3/250 NT-4/2501) = Nominal current consumption of all indoor climate units in the system

Table K17: Size of the safety relay without switch-off of the neutral wire (3-pin) and with switch-off of the neutral wire (4-pin)

Integration of indoor climate units without integrated DigiUnit cont-rollerIndoor climate units without an integrated DigiUnit controller are, for example, TopVent® supply air units or additional units that are added on depending on the heat or cool demand. For such units, the control system and the power supply (circuit breaker, contactor, output terminals) is integrated in the zone control panel.There are 2 possibilities:

■ Separate connection: 1 DigiUnit controller or 1 DigiEco controller is installed for each unit (including the power supply for the indoor climate unit).

■ Parallel connection: 1 DigiUnit controller or 1 DigiEco controller is installed for a group of units, including the power supply for the first unit. Additional output terminals are installed for the parallel connection of additional units. The number of parallel controlled units is restricted by the maximum switch power of 6.5 kW (∆ / Y connection).

Type Design Use

DU5 DigiUnit controller including power supply for 1 unit

For main units without integrated DigiUnit controller

DO5 DigiEco controller including power supply for 1 unit

For additional units

SV Power supply for additional units

Parallel connection

Table K18: Integration of indoor climate units without integrated DigiUnit controller

Cooling in the 2-pipe systemThe same coil is used for heating and cooling. The DigiNet system is switched between heating and cooling manually. A selector switch, two switch relays and the additional termi-nals for enable cooling and the trouble input cooling are installed in the zone control panel.Type: 2K

Control systems

Options

264

Cooling in the 4-pipe systemThere is a separate coil for heating and for cooling. The DigiNet system is switched between heating and cooling automatically. Two switch relays and the additional terminals for enable cooling and the trouble input cooling are installed in the zone control panel.Type: 4K

Room temperature average valueInstead of only 1 room air sensor, 4 sensors are provided to determine the average value; the corresponding terminals are integrated.Type: MRT

DigiPlus controllerThe DigiPlus controller is installed in the zone control panel in addition to the DigiZone controller. It enables the following additional functions:

■ Humidity control: Depending on the relative humidity of the room air, DigiNet gives an output signal (DC 0…10 V) to control humidity equipment. (Required: humidity sensor, built-in humidity equipment)

■ Ventilation according to requirements: The speed of the fans and therefore the air change speed is varied accor-ding to the CO2 concentration in the room. (Required: Fans with variable volume flow, CO2 sensor)

■ External control of volume flow: Fans with a variable volume flow (option) can be controlled by an external signal (DC 0...10 V).

■ Cascading electro coils: The DigiPlus controller switches up to three 2-level electro coils for each control zone depending on the analog heating valve output.

Type: DP5

Humidity sensorThe sensor measures the relative humidity in the room air as a basis for humidity control. It is installed on the wall in the occupied area, at a height of about 1.5 m.

Type FF

Measurement range 0…100 %

Output signal DC 0…10 V

Table K19: Technical data for the humidity sensor

CO2 sensorThe sensor measures the CO2 concentration in the room air as a basis for ventilation as required. It is installed on the wall in the occupied area, at a height of about 1.5 m.

Type CO2

Measurement range 0…2000 ppm

Output signal DC 0…10 V

Table K20: Technical data for the CO2 sensor

Base for the zone control panelZone control panels in sizes 7 to 9 are available with a sheet steel base, height 200 mm.Type: SO

Control systems

Options

265

B

E

E

F

G

H

I

J

K

M

N

7 Alarms and monitoring

The Hoval DigiNet monitors itself. All alarms are entered in the alarm list and displayed on the operator terminals. Priority A alarms are also displayed via the collective trouble indicator.

Caution If the power supply for the DigiUnit terminal box is interrupted, frost protection and monitoring are not guaranteed. The only indication that a DigiUnit controller has broken down is when it is no longer displayed on the operator terminal. You should there-fore check regularly that the display is complete.

Alarm Priority Cause System reaction BenefitFrost A The temperature according to the

heating coil has fallen under 11 °C.The mixing valve heating opens. Avoids interruptions of plant

operation and damage due to frost.The temperature according to the

heating coil has fallen under 5 °C. ■ The frost alarm is displayed. ■ The mixing valve heating opens 100 %. ■ The relevant indoor climate unit switches to

operating mode 'Off'.Trouble with heating/cooling

A The heat/cold supply is not available. DigiNet switches to the 'Off' operating mode. Avoids undefined operating states.

Fans A A fan motor has overheated. The relevant indoor climate unit switches to operating mode 'Off'.

Avoids damage to the pump motor.

Fresh air damper A The fresh air damper is jammed or the fresh air/recirculation damper actuator is defective.

The relevant indoor climate unit switches to operating mode 'Off'.

Prevents loss of energy / undefined operating states

ER damper A The ER damper is jammed or the ER/bypass damper actuator is defective.

If the fresh air temperature is less than 11 °C, the respective indoor climate unit switches to operating mode 'Off.'

Prevents loss of energy / undefined operating states

Heating/cooling pump, heat pump

A A malfunction has occurred at the heating/cooling pump, the heat pump or the gas boiler.

The relevant indoor climate unit switches to operating mode 'Off'.

Avoids damage to the pump motor.

Fresh air sensor B The fresh air sensor is defective. DigiNet operates at a fresh air temperature of 0 °C until the fault is eliminated.

Avoids interruptions of operation.

Room air sensor B The room air sensor is defective. The DigiNet continues to work with the set value as the room temperature until the fault is eliminated.


Supply air sensor B The supply air sensor is defective ■ The DigiNet continues to work with a supply air temperature of 20 °C until the fault is eliminated.

■ The ER damper opens 100 %. ■ The supply air is directed horizontally


Extract air sensor B The extract air sensor is defective. – Avoids interruptions of operation.

Isolation B The isolation switch on the unit has been in the 'Off' position for more than 30 minutes.

– Avoids unintentional swit-ching off.

Filter B The set pressure difference for filter monitoring was exceeded for more than 5 minutes.

– Informs the user of the necessity of maintenance work

Table K21: Alarms in Hoval DigiNet

Control systems

Alarms and monitoring

System design L

1 Roof frame ________________________268

2 Location of the temperature sensors ___269

3 Orientation of the coil connections _____269

4 Condensation lilmit _________________270

5 Duct connection ___________________ 271

6 Paint finish ________________________ 271

7 Socket ___________________________ 271

8 Corrosion-protected design __________ 271

9 Lightning protection system __________ 271

10 General checklist __________________ 271

System design

Content

268

H

A

A

≥ 20

0

200 J

3030

Access panel

Extract air grille

For dimensions H and J, see 'Technical data' section of the respective unit type

Sealing strip (fitted at the factory)

Sealing on the roof frame (to be effected by the installer, e.g. using silicone)

Weathering skirt of the roof unit

Roof frame

Fig. L3: Installation of the RoofVent® units in the roof frame (dimensions in mm)

1 Roof frame

Roof frames are required for installing RoofVent® units in the roof. Please consider the following in the design process:

■ The access panel and extract air grille must be freely accessible under the roof.

■ The roof frame must protrude at least 200 mm from the roof, so that no water can penetrate during a rainstorm or snowfall.

Note If none of the three standard filter box lengths ( F00, F25, F50 ) meets these requirements, the filter box is also available in special lengths.

■ The opening (dimension U) must be large enough to accommodate the below-roof unit.

■ The outside dimension (dimension T) must be just large enough to ensure that the weathering skirt of the roof unit still covers the roof frame.

■ The roof frame must be insulated. ■ The roof frame must be flat and horizontal. ■ Please observe the minimum distances when designing

the roof frame (see the 'Technical data' of the respective unit type). If necessary, change the orientation of the coil connections.

Depending on local conditions, 2 different types of roof frame can be used:

■ Roof frame with straight side walls (where there is sufficient space)

■ Roof frame with conical side walls all around (where a below-roof unit protruding into the room interferes with the craneways, for example)

≥ 50

0

20°…45°

Fig. L1: Roof frame with straight side walls

Fig. L2: Roof frame with conical side walls

System design

Roof frame

269

B

E

E

F

G

H

I

J

K

L

N

2 Location of the temperature sensors

2.1 Room air sensor

Install the sensor at a height of about 1.5 m in a representa-tive location in the occupied area. Its measured values must not be distorted by the presence of sources of heat or cold (machines, direct sunlight, windows, doors, etc.).Normally, you should use one room air sensor for each control zone. It is also possible to install four sensors to determine the average temperature value.

2.2 Fresh air sensor

Install the sensor at least 3 m above the ground on a north-facing wall, so that it is protected from direct sunlight. Provide additional cover for the sensor and thermally insulate it from the building.Only one fresh air sensor is needed per system.

Extract air and supply air sensors are installed in the RoofVent® units.

3 Orientation of the coil connections

The heating or cooling section is usually fitted to the filter box in such a way that the coil connections are underneath the extract air grille (see Fig. L5). Check the local installation conditions. If a different orientation is required, please specify on the purchase order.

Fig. L5: Orientation of the coil connections

Fig. L4: Conceptual drawing

T

U

Load-bearing outside wall of the roof frame, position as centrally as possible on IPE beams

Insulation (e.g. 40 mm PU foam)

IPE beam

Unit size 6 9 10

T Max. mm 1000 1240 1240

U Min. mm 914 1154 1154

Table L1: Dimensions for roof frame

System design

Location of the temperature sensors

270

4 Condensation lilmit

RoofVent® twin heat / twin cool / twin pump

At high humidity levels or extremely low fresh air tempera-tures, humidity in the extract air may condense in plate heat exchanger 2. Diagram M1 shows under what air conditions condensation occurs. In applications where the condensation limit is exceeded:

■ Connect the condensate drain connection in the combi box to a condensate drainage system.

■ Where required, use a condensate pump to discharge condensate through waste water pipes directly below the ceiling or onto the roof.

■ Use the option drop eliminator for the plate heat exchanger 1 in the roof unit.

Extract air temperature

Rel

ativ

e ex

tract

air

hum

idity

[%]

20

30

40

50

60

70

80

90

-20 -15 -10 -5 0 5 10

20 °C

22 °C

24 °C

26 °C

28 °C

Fresh air temperature [°C]

Refers to: Air pressure 1013 hPa

Diagram 1: Condensation limit for plate heat exchanger 2 in RoofVent® twin units

System design

Condensation lilmit

271

B

E

E

F

G

H

I

J

K

L

N

5 Duct connectionIf required, it is possible to connect extract air and supply air ducts.

Fig. L6: Extract air duct – connection to the filter box in place of the extract air grille

Fig. L7: Supply air duct – connection to the heating section in place of the Air-Injector

Unit size 6 9 10

J 410 450 450

K 848 1048 1048

R 900 1100 1100

X 850 1050 1050

Table L2: Dimensions for connection of extract air and supply air duct (for dimensions G and M, see 'Technical data' for the respective unit type)

6 Paint finishOn request, the RoofVent® units can be provided with an exterior paint finish (Aluzinc is standard). Please indicate the desired RAL numbers for the roof unit and the below-roof unit in your purchase order.

7 SocketFor maintenance and repair work, a socket (1-phase, AC 230 V, 50 Hz) can be installed in the roof unit, next to the DigiUnit terminal box.

8 Corrosion-protected designRoofVent® units in corrosion-protected design are available for applications in which the air flows contain aggressive elements. Please contact Hoval customer service.

9 Lightning protection systemMake sure you obtain professional planning and design of a lightning protection system for the units and/or for the entire building.

10 General checklist ■ Can the roof support the units? ■ Is the roof accessible for service and maintenance in the

vicinity of the RoofVent® units? ■ Are the access panels accessible without obstacles? ■ Are there installation problems in the hall, such as crane-

ways, machines, etc? ■ Is the air volume balanced? ■ Are the application limits complied with? ■ Are direct machine extraction systems necessary? ■ Which heating or cooling medium is being used? ■ What should the length of the filter box be? ■ Are unit options required? ■ Are control system options required? ■ How are the control zones subdivided? ■ Which operating options are to be used? ■ Where are the operating options to be located?

System design

Duct connection

Operation M

1 Operation _________________________ 274

2 Maintenance and repair _____________ 274

3 Dismantling _______________________276

4 Waste disposal ____________________276

Operation

Content

274

1 Operation

1.1 Start-up

Caution Risk of damage to property as a result of performing initial start-up on your own authority. Commissioning must be performed by Hoval customer service only !

Checklist to prepare for commissioning: ■ Have all media connections been established (wiring,

water connections, condensate drains, where applicable refrigerant pipes and air duct connections)?

■ Is the heating medium and/or cooling medium available? ■ Are the hydraulics aligned and balanced? ■ Are all control components installed and connected to the

novaNet system bus? ■ Are all of the respective trade groups (installer, electrician,

designer, etc.) present at the scheduled time? ■ Are the system operating personnel present for training at

the scheduled time?

1.2 Operation

The system runs fully automatically in accordance with the operating times and temperature conditions.

■ Follow the operating instructions for the DigiNet operator terminals.

■ Check alarm displays daily. ■ Correct changes to operating times in the automatic

programming. ■ Ensure free air outlet and unhindered dispersion of the

supply air.

1.3 Decommissioning

Caution Risk of property damage due to frost. When shut-ting down the system, take appropriate measures to ensure that the heating or cooling medium does not freeze.

Take one of the following steps to prevent frost damage when decommissioning the system:

■ Make sure that the room temperature is high enough. ■ Have professional personnel drain off the heating/cooling

medium circuit. ■ Have professional personnel frost-proof the heating/

cooling medium circuit with antifreeze. ■ For RoofVent® twin pump: Secure voltage supply for the

condenser (operation of the oil sump heating).

2 Maintenance and repair

2.1 Safety during maintenance

■ Before undertaking any work on the unit: turn the isolation switch to the 'Off' position. Wait for the fans to stop.

Caution Danger from electric current. The isolation switch only switches off the fans; the control system is still live! Before performing work on the control system, switch off the entire control zone at the mains disconnection switch and secure it with a padlock against being switched back on.

■ Observe the accident prevention regulations. ■ Observe the particular dangers involved in working on the

roof and on electrical systems. ■ When working in the unit, take precautions against unpro-

tected, sharp steel plate edges. ■ Immediately replace damaged or removed informational

and warning signs. ■ Following maintenance work, reattach all dismantled

protective devices properly. ■ Unauthorised reconfiguration or modification of the unit is

not permitted. ■ Replacement parts must comply with the technical requi-

rements of the system manufacturer. Hoval recommends the use of original replacement parts.

2.2 Filter change

Caution Risk of injury if work is not performed appropriately. Filters must be changed by trained personnel !

Each RoofVent® unit is equipped with a differential pressure switch which monitors the fresh air filter and the extract air filter. Change the filter when the 'Filter' alarm is displayed on the operator terminal:

Changing the fresh air filter ■ Switch isolation switch to the 'Off' position and wait for the

fans to stop. ■ Open weather louvre door (Pos. ). ■ Change fresh air filter (Pos. ). ■ Close weather louvre door and return isolation switch to

the 'On' position.

Changing the extract air filter ■ Switch isolation switch to the 'Off' position and wait for the

fans to stop. ■ Remove access panel (Pos. ). ■ Change extract air filter (Pos. ).

Operation

Operation

275

B

E

E

F

G

H

I

J

K

M

M

■ Fit access panel again and return isolation switch to 'On' position.

RoofVent® LHW, LKW, condens

RoofVent® twin heat/cool/pump:

RoofVent® LH, LK

Weather louvre door

Fresh air filter

Access panel

Extract air filter

Table M1: Position of the filters in the RoofVent® units

2.3 Inspection and maintenance work

Caution Risk of injury if work is not performed appropriately. Inspection and repair work must be carried out by Hoval customer service personnel !

The following work is carried out during the annual inspec-tion:

■ Cleaning of the units ■ Fan and actuator function tests ■ Function testing of the control systems ■ Where siphons are fitted: testing of the odour seal. ■ On the RoofVent® condens: Check system pressure, frost

protection, pH value, burner and ignition electrode. ■ On the RoofVent® condens: Replace neutraliser cartridge.

The following work is carried out every 3 years: ■ On the RoofVent® condens: Check inhibitor protection.

Condensate pump (optional)On RoofVent® units equipped with a condensate pump:

■ Check condensate pump every two months during the cooling period and clean it if required.

2.4 Repairs

Caution Risk of injury is work is not performed appropriately. Repair work must be carried out by Hoval customer service personnel !

Please contact Hoval customer service if needed.

Operation

Maintenance and repair

276

3 Dismantling

Caution Risk of injury if work is not performed appropriately. Dismantling must be carried out by specialists !

Make sure that the following items are on hand: ■ A crane or helicopter ■ Two slings (sling length approx. 6 m each) ■ Two transport eyes

Access panel

Access panel

Screw connection

Table M2: Dismantling the RoofVent® units

Proceed as follows: ■ Drain the heating or cooling circuit.

– On the RoofVent® twin pump: The refrigerant must be drawn off by a refrigeration specialist.

– On the RoofVent® condens: Collect heat accumulator fluid.

■ Disconnect all media connections from the unit (wiring, water connection, condensate drain, where applicable refrigerant pipe and air duct connections).

■ Release the unit from all roof fittings, lightning protection systems and frame attachments.

■ Remove the access panels on both sides of the roof unit (Pos. , ).

■ Release the screw connection between roof unit and below-roof unit (4 screws, Pos. ).

■ Attach the slings to the roof unit. ■ Carefully lift the roof unit slightly and detach it from the

below-roof unit (note the initial adhesion of the sealing strips).

Caution Danger of fatal injury through falling parts. Never lift the two-part unit (roof unit, below-roof unit) in one piece!

■ Remove the roof unit. ■ Screw in the transport eyes into the below-roof unit frame

and attach the lifting gear. ■ Lift the below-roof unit out of the roof frame and transport

it away.

4 Waste disposal

Observe the following when disposing of the components of RoofVent® units:

■ Recycle metal components. ■ Recycle plastic parts. ■ Dispose of electric and electronic parts via hazardous

waste. ■ For RoofVent® twin pump: Recycle refrigerant. ■ For the RoofVent® condens: Dispose of heat accumulator

fluid in the prescribed manner.

Operation

Dismantling

1

Hoval heating technology

As a full range supplier Hoval helps its customers to select innovative system solutions for a wide range of energy sources, such as heat pumps, biomass, solar energy, gas, oil and district heating. Services range from small commercial to large-scale industrial projects.

Responsibility for energy and environmentThe Hoval brand is internationally known as one of the leading suppliers of indoor climate control solutions. More than 70 years of experience have given us the nec-essary capabilities and motivation to continuously develop exceptional solutions and technically advanced equipment. Maximising energy effi ciency and thus protecting the environment are both our commitment and our incentive. Hoval has established itself as an expert provider of intelligent heating and ventilation systems that are exported to over 50 countries worldwide.

Hoval comfort ventilation

Increased comfort and more effi cient use of energy from private housing to business premises: our comfort ventilation products provide fresh, clean air for living and working space. Our innovative system for a healthy room climate uses heat and moisture recovery, while at the same time protecting energy resources and providing a healthier environment.

Hoval indoor climate systems

Indoor climate systems ensure top air quality and economical usability. Hoval has been installing decentralised systems for many years. The key is to use combinations of multiple air-conditioning units, even those of different types, that can be controlled separately or together as a single system. This enables Hoval to respond fl exibly to a wide range of require-ments for heating, cooling and ventilation.

InternationalHoval AktiengesellschaftAustrasse 709490 Vaduz, LiechtensteinTel. +423 399 24 [email protected]

United KingdomHoval Ltd.Northgate, NewarkNottinghamshireNG24 1JNTel. 01636 [email protected]

RoofVent® Design HandbookSubject to technical alterationsArt.No. 4 210 755 – Edition 03 / 2018© Hoval Aktiengesellschaft, Liechtenstein, 2012

Design Handbook · The DigiNet control system controls these operating modes automatically per...

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Transcript of Design Handbook · The DigiNet control system controls these operating modes automatically per...